My thoughts so far:
Mage: Fire is tonnes of fun, feels quite like shadow priest in a sense as a lot of it is Dot Management, good dps output and more fun than my old arcane 2buttondpsplz spec. Frost on the otherhand has had a nerfbat applied pretty hard, ive not got any specifics because havent had much time to look it over but crit burst it relies on has been reduced and my overall dmg seems down (1.5k frostbolt...wtf)
Warrior: Only have arms pvp experience of this patch so far and i must say....balls deep in fun even though no piercing howl and 10yd range for demo shout is making me weep. We lost Execute proc ability but it feels like the burst is better, with MS doing hefty dmg along with HS. Overall im liking it.
Shadow Priest: Blizzard, BC is forgiven. I log on with 1k extra dummy dps, nomnmnom DoT clipping is an issue no more really. Shadow Word: Death is making my healers worry but im luvzing it, though im still stuck in the old rotation might need to incorporate the Shadow Orbs more. Not pvped yet but im loving the pve side of things a lot. (spawning mini-mes when i run is cool
)
Shaman: NB im levelling her (76 atm) Elemental seems to hit like a roundhouse from Chuck Norris, queueing up Fulmination and Lava Burst crits always fun
Enhancement, not had too much time with it atm but it doesnt feel different atm maybe im just missing something.
Paladin: NB im levelling him (48 atm) Respecced retri for a change (was prot) and so atm ive got a 1her which is gimping my dmg output but the class feels good to use, keeping track of holy power isnt such a big deal. Not much more to add
Other classes ive not bothered tinkering atm, all in due time i guess. In short good show Blizz even if it is buggier than fly paper in the amazon (audio lags, lags in general and name plate bugs which has gotten me killed many a time so far)
P.S. Im a nub so if you disagree with my post....youre probably right ^^