The patch 3.1 changes have not been sitting well with some players. Death Knights are up in arms about their nerfs, and Mages are feeling as rejected as ever.
And Warlocks? Who plays those anymore. I received a free level 70 Death Knight in exchange for deleting mine. True story.
All kidding aside, I personally don't think Blizzard has it out for any one class. But I know that many in the community don't share my feelings. And while nerfs are never personal (aka, Ghostcrawler doesn't say "That damn Holisky, just because he posted this article we're going to nerf Shamans!"), they are often taken quite personal by the player base.
So for today's important poll (all polls are important after all): what class does Blizzard hate the most?