With the current latency on Icecrown it's imposible to play feral druid on high population peek, the shapeshifting and abilities like shred are directly dependent on latency, other clases are also affected but not as much, especialy caster specs with cast time no dots, I know not all are affected in the same way due to region but the ones that are further from server location get over 100 latency and that's ruining the gameplay. And I am not talking about ppl with realy bad internet or other problems I'm talking about ppl who had 40 ms on Deathwing and now have over 100. An acceptable latency to not ruining the game is around 60 max for me even tho' some ppl have even 10 ms or less experience player feel even the slightest change and know the advantage of it. Even AH is laging.
Its currently 113 server MS, not sure if its because the population is too high currently or there is some porb, but just have patient bro i am sure its being worked on