I think the primary interest for most of the community is figuring out pre-nerf values and World of Warcraft Bestiary is 2.3 so you lose the quest for pre-nerf values by default if you use it as a source. In addition, I'm not quite certain about its validity for raids, in the past I've noticed some oddities (it seems clear the authors got Blizzard's database dump, but there could be some systematic error for raids that I haven't figured out, or it might be human error on individual mobs, or I might be imagining things). Nonetheless, it is a primary source that doesn't rely on spending countless hours watching videos recording values to a spreadsheet (while trying to guess tank mitigation which might be difficult to know exactly) or trying to figure out a multiplier that converts retail server values to TBC ones (and then letting mobs hit you on retail server to figure out their damage ranges) which can lead to major systematic error (and is prone to other error sources, like Blizzard having changed the numbers to make content soloable, or patches breaking mechanics without them ever getting fixed).
Consequently, for all their faults, they do have a number of uses, be it sanity-checking another set of numbers or serving as a base set of "correct" numbers that can be then blanket-buffed while maintaining the relative tuning between mobs and bosses. Or some servers might actually want to implement post-nerf values even if it's not fashionable right now. Only damage values are listed because spell values tend not to be listed, spell lists are regularly incomplete and the exact values have usually been datamined anyway.
Karazhan
Spectral Stallion: N/A
Spectral Charger: 3851-5446
Spectral Stable Hand: 1821-2572
Attumen the Huntsman: 4715-7508
Midnight: 4248-6007
Spectral Servant: 2416-3570
Spectral Apprentice: 2272-3213
Coldmist Widow: 3081-4357 (105 fire resist)
Shadowbat: 1450-2142
Coldmist Stalker: 757-1071 (105 fire resist)
Greater Shadowbat: 4107-5809
Vampiric Shadowbat: 3081-4357
Dreadbeast: 4107-5809
Shadowbeast: 2416-3570
Phase Hound: 2020-2856 (105 arcane resist)
Hyakiss the Lurker: 4780-6758
Shadikith the Glider: 4780-6758
Rokad the Ravager: 3585-5068
Wanton Hostess: 3081-4357
Concubine: 3081-4357
Night Mistress: 2859-4039
Phantom Guardsman: N/A
Spectral Sentry: 3081-4357
Phantom Hound: N/A
Maiden of Virtue: 6157-8696
Phantom Guest: N/A
Phantom Valet: N/A
Phantom Attendant: N/A
Ghostly Steward: N/A
Skeletal Waiter: 3850-5446
Spectral Retainer: 4705-6654
Spectral Servant: 2416-3570
Moroes: 4780-6758
Lady Keira Berrybuck: 2109-2980
Lady Catriona Von'Indi: 109-980
Dorothea Millstipe: N/A
Baron Rafe Dreuger: 2109-2980
Lord Crispin Ference: 2272-3213
Lord Robin Daris: 2272-3213
Spectral Chef: 4621-6535
Ghostly Baker: N/A
Spectral Patron: 1136-1607
Skeletal Usher: 5334-7537
Ghostly Philanthropist: N/A
Spectral Performer: 4621
Phantom Stagehand: N/A
Dorothee: 2463-3478
Tito: 841-1180
Strawman: 4182-5915
Tinhead: 4182-5915
Roar: 2509-3549
The Crone: 4925-6957
The Big Bad Wolf: 4142-5857
Julianne: 2955-4174
Romulo: 3983-5632
Ghastly Haunt: 8364-11829
Trapped Soul: N/A
Nightbane: 9028-12765
Restless Skeleton: 1615-2499
Arcane Watchman: 5751-8132
Arcane Anomaly: 3291-4643 (75 arcane resist)
Syphoner: 1406-1986
The Curator: 5467-7722
Astral Flare: N/A
Arcane Protector: 7842-11090
Astral Spark: N/A
Mana Feeder: 757-1071
Chaotic Sentience: 2424-3485 (75 arcane resist)
Mana Warp: 1515-2142
Magical Horror: 2859-4039
Spell Shade: 3081-4357
Shadow Pillager: 1940-2741
Homonculus: 703-993
Terestian Illhoof: 5050-7140
Kil'rek: 1874-2852
Fiendish Imp: 206-304
Shade of Aran: 2063-2992
Conjured Elemental: N/A
Sorcerous Shade: N/A
Ethereal Thief: 6273-8872
Ethereal Spellfilcher: 5820-8222
Netherspite: 7515-8186
Fleshbeast: 4600-6506
Greater Fleshbeast: 7528-10646
Prince Malchezaar: 6638-9386
Magtheridon's Lair
Hellfire Warder: 5335-7537
Hellfire Channeller: 4926-6957
Magtheridon: 14604-20649
Burning Abyssal: 1009-1428
Gruul's Lair
Lair Brute: N/A
Gronn Priest: 6304-8907
High King Maulgar: 12214-17270
Olm the Summoner: 4104-5792
Krosh Firehand: 4101-5792
Kiggler the Crazed: 6834-9653
Blindeye the Seer: 1724-2435
Wild Fel Stalker: 1474-2084
Gruul: 6904-9761
Serpentshrine Cavern
Coilfang Beast-Tamer: 7188-10166
Serpentshrine Sporebat: 3466-4901
Coilfang Hate-Screamer: 3812-5386
Underbog Colossus: 7842-11090
Colossus Rager: 757-1071
Colossus Lurker: 6418-9077
Purified Water Elemental: 770-1089
Tainted Water Elemental: 770-1089
Hydross the Unstable: 5974-8447
Tainted Spawn of Hydross: 3081-4357
Pure Spawn of Hydross: 3081-4357
Vashj'ir Honor Guard: N/A
Coilfang Priestess: 3812-5386
Greyheart Technician: 1027-1452
Coilfang Shatterer: 6675-9440
Coilfang Frenzy: 935-1239
The Lurker Below: 11949-16895
Coilfang Ambusher: 2343-3311
Coilfang Guardian: 7574-10710
Coilfang Serpentguard: 6675-9440
Greyheart Nether-Mage: 3812-5386
Greyheart Tidecaller: 4764-6732
Greyheart Skulker: 8985-12707
Coilfang Fathom-Witch: 3812-5386
Serpentshrine Lurker: 7574-10710
Greyheart Shield-Bearer: 6418-9077
Greyheart Spellbinder: 5717-8079
Leotheras the Blind: 7169-10436
Shadow of Leotheras: 7169-10436
Inner Demon: 1307-848
Fathom-Lord Karathress: 8866-12522
Fathom-Guard Tidalvess: 10005-14138
Fathom-Guard Sharkkis: 5956-8416
Fathom Lurker: 6777-9585
Fathom Sporebat: 2054-2905
Fathom-Guard Caribdis: 5956-8416
Tidewalker Warrior: 5134-7261
Tidewalker Shaman: 3812-5386
Tidewalker Hydromancer: 3812-5386
Tidewalker Depth-Seer: 4288-6059
Tidewalker Harpooner: 4621-6535
Morogrim the Tidewalker: 12745-18021
Tidewalker Lurker: 1540-2178
Water Walker Elemental: I'm posting the whole information because this is interesting: apparently the Morogrim elementals were left in database and found their way to the book despite being removed in the game. Level 71, 1797-2541 damage, 107715 health, no mana, 7089 armor, Water Bolt: Hurls a watert bolt at an enemy, inflicting 189 to 231 frost damage; Surge: Charges an enemy, inflicting normal damage; Spell Reflection
I think the primary interest for most of the community is figuring out pre-nerf values and World of Warcraft Bestiary is 2.3 so you lose the quest for pre-nerf values by default if you use it as a source. In addition, I'm not quite certain about its validity for raids, in the past I've noticed some oddities (it seems clear the authors got Blizzard's database dump, but there could be some systematic error for raids that I haven't figured out, or it might be human error on individual mobs, or I might be imagining things). Nonetheless, it is a primary source that doesn't rely on spending countless hours watching videos recording values to a spreadsheet (while trying to guess tank mitigation which might be difficult to know exactly) or trying to figure out a multiplier that converts retail server values to TBC ones (and then letting mobs hit you on retail server to figure out their damage ranges) which can lead to major systematic error (and is prone to other error sources, like Blizzard having changed the numbers to make content soloable, or patches breaking mechanics without them ever getting fixed).
Consequently, for all their faults, they do have a number of uses, be it sanity-checking another set of numbers or serving as a base set of "correct" numbers that can be then blanket-buffed while maintaining the relative tuning between mobs and bosses. Or some servers might actually want to implement post-nerf values even if it's not fashionable right now. Only damage values are listed because spell values tend not to be listed, spell lists are regularly incomplete and the exact values have usually been datamined anyway.
Karazhan
Magtheridon's Lair
Gruul's Lair
Serpentshrine Cavern
Tempest Keep
Black Temple
Hyjal