I want everyone to think back to the best iterations of every spec in the game, and point out what you thought was the most fun.
I'll give my top 10.
1. 7.0 Unholy DK
2. 4.3 Assassination Rogue
3. 4.3 Arms Warrior
4. 7.0 Enhancement Shaman
5. 3.0 32/39 Frost/Unholy DK
6. 4.0 Retribution Paladin
7. 5.4 Frost Mage
8. 1.2 Enhancement 2h Shaman
9. 7.0 Frost DK
10. TIE - 3.3 Affliction Warlock / 3.3 Balance Druid