Knights Of Sparta

I've observed the (sometimes vast) discrepancies in the Blizzard supplied 'Advised' character levels for Dungeons. It has come to the point whereby it's nigh on impossible to judge what level you should be in order to observe any kind of challenge in a dungeon.

I've therefore put some work into this and have produced a more up to date list based on a number of factors.

The figure range I've given is a 'comfortable' range. By this I mean it'll be a challenge to complete without wiping if your group are of these levels and not a straight walkthrough. The figures in brackets are the Blizzard supplied 'maximum' level to give you some idea of how ridiculous it has become. If you pick up a group through the Looking For Dungeon tool you will be in a group of people up to those silly figures.

Min - Max (Blizz) Dungeon Levels

Classic
Ragefire Chasm................................................ 13 - 15 (21)
The Deadmines................................................ 13 - 15 (21)
Wailing Caverns................................................ 17 - 20 (25)
Shadowfang Keep............................................. 18 - 21 (26)
Blackfathom Deeps........................................... 22 - 24 (30)
The Stockade................................................... 22 - 24 (30)
Gnomeregan.................................................... 25 - 28 (34)
Scarlet Monastery: Graveyard............................. 28 - 30 (36)
Scarlet Monastery: Library.................................. 29 - 31 (39)
Razorfen Kraul.................................................. 30 - 32 (40)
Maraudon (Purple)……………………………………....… 32 - 34 (40)
Scarlet Monastery: Armory................................. 34 - 37 (42)
Maraudon (Orange)………………………………………… 34 - 37 (42)
Maraudon (Earth Song Falls)………………….……….. 36 - 39 (44)
Scarlet Monastery: Cathedral.............................. 37 - 40 (45)
Uldaman........................................................... 37 - 40 (45)
Dire Maul: East.................................................. 38 - 41 (46)
Scholomance.................................................... 40 - 43 (48)
Dire Maul: West................................................. 41 - 44 (49)
Razorfen Downs................................................ 42 - 45 (50)
Dire Maul: North................................................ 43 - 46 (52)
Stratholme: Live (Main)…………………………………… 44 - 47 (52)
Zul'Farrak......................................................... 45 - 49 (54)
Stratholme: Undead (Service)……………….………… 47 - 51 (56)
Blackrock Depths (Detention)…………………….……. 48 - 52 (57)
Sunken Temple.................................................. 51 - 55 (60)
Blackrock Depths (Upper City)…………………………. 52 - 56 (61)
Lower Blackrock Spire........................................ 55 - 60 (65)
Upper Blackrock Spire........................................ 55 - 60 (65)

Burning Crusade
Hellfire Citadel: Hellfire Ramparts........................ 58 - 61 (67)
Hellfire Citadel: The Blood Furnace...................... 60 - 63 (68)
Coilfang Reservoir: The Slave Pens...................... 61 - 64 (69)
Coilfang Reservoir: The Underbog....................... 61 - 64 (70)
Auchindoun: Mana-Tombs................................... 63 - 66 (71)
Auchindoun: Auchenai Crypts.............................. 64 - 67 (72)
Caverns of Time: Escape from Durnholde…….…… 65 - 68 (73)
Auchindoun: Sethekk Halls................................. 66 - 69 (73)
Auchindoun: Shadow Labyrinth.......................... 65 - 67 (75)
Coilfang Reservoir: The Steamvault..................... 65 - 67 (75)
Hellfire Citadel: The Shattered Halls.................... 68 - 69 (75)
Caverns of Time: The Black Morass..................... 68 - 69 (75)
Tempest Keep: The Botanica.............................. 68 - 70 (75) Need Flying
Tempest Keep: The Mechanar............................. 69 - 70 (75) Need Flying
Tempest Keep: The Arcatraz............................... 69 - 70 (75) Need Flying

Magisters' Terrace.............................................. 70 - 72 (75)

Wrath of the Lich King
Utgarde Keep: Utgarde Keep.............................. 68 - 70 (72)
The Nexus: The Nexus...................................... 69 - 71 (73)
Azjol-Nerub: Azjol-Nerub.................................... 70 - 72 (74)
Azjol-Nerub: Ahn'kahet: The Old Kingdom........... 71 - 73 (81)
Drak'Tharon Keep.............................................. 72 - 74 (82)
The Violet Hold.................................................. 74 - 75 (82)
Gundrak............................................................ 75 - 76 (82)
Ulduar: Halls of Stone........................................ 76 - 77 (82)
Caverns of Time: The Culling of Stratholme......... 78 - 80 (82)
The Nexus: The Oculus...................................... 78 - 80 (82)
Ulduar: Halls of Lightning................................... 78 - 80 (82)
Utgarde Keep: Utgarde Pinnacle.......................... 78 - 80 (82)

Crusader Coliseum: Trial of the Champion........... 79 - 80 (82)

Frozen Halls: Forge of Souls................................ 80 - 81 (82)
Frozen Halls: Pit of Saron.................................... 80 - 81 (82)
Frozen Halls: Halls of Reflection........................... 80 - 81 (82)

Cataclysm
Abyssal Maw: Throne of the Tides....................... 80-82 (83)
Blackrock Mountain: Blackrock Cavern................. 80-82 (83)
The Stonecore................................................... 82-84 (??)
The Vortex Pinnacle............................................ 82-84 (??)
Grim Batol......................................................... 84-85 (??)
Halls of Origination............................................. 84-85 (??)
Lost City of the Tol'vir......................................... 84-85 (??)

L85 Heroics require iLevel329

Zul'Gurub (heroic only)....................................... 85 - ilvl346
Zul'Aman (heroic only)........................................ 85 - ilvl346

Caverns of Time: End Time ................................ 85 - ilvl???
Caverns of Time: Well of Eternity......................... 85 - ilvl???
Hour of Twilight.................................................. 85 - ilvl???

Original post updated with Cataclysm dungeons, let me know if they're way out.

Zul'Gurub and Zul'Aman to be added