Casters and Hunters ranked and sorted into a neat little tierlist. While this list may be true if skill levels are equal, that doesn't mean that you can't top the meters as any of the classes on this list if you play better than your peers. The rankings will fluctuate somewhat throughout the Cataclysm expansion, but will generally be true and as such, help you in the process of picking a main if sweaty minmaxing interests you.

If you want to check out the other rankings, you can do so here:
Tank:    • Ranking WOW Cataclysm Tanks From Best...  
Healer:    • Ranking WOW Cataclysm Healers From Be...  
Melee DPS:    • Ranking WOW Cataclysm Melee DPS From ...  

Timestamps:
00:00 Intro
00:49 Hunter
01:23 Survival
02:16 Beast Mastery
02:45 Marksmanship
03:28 Elemental
04:45 Balance
06:11 Shadow
07:02 Mage
07:18 Fire
08:00 Frost
08:10 Arcane
08:56 Warlock
09:30 Demonology
10:27 Affliction
11:08 Destruction
11:50 Conclusion