Huge nerf to tank+4shaman PVE teams, healing stream totem was a massive pulsing heal (700-1k hp/tick dep on glyphs etc), it'll drop down to 200 hp/tick which sucks.

Also mana regen in combat and ooc get nerfed in 3.1, so don't be too sure about "lol i never run out of mana", you may in 3.1...

3.1 so far feels like a downer of a patch, every class almost is getting nerfed or mechanics changed to make it slightly more unfun. Ulduar is also crazy hard so far, the first fight alone is a really fun but difficult vehicle combat fight (done it on PTR, gonna be insane to try and multibox). The sixth boss is just nuts, two hands and a body and the boss hits for 20-30k a swing on 40k hp tanks.