I left in August, then returned this week. I'm rerolling rogue.
I had a 70 hunter and druid who both were in Sunwell when I quit.
I returned to find raiding has been destroyed, the content is far too easy (found this out from several friends who still raid, who I raided with.) Hearing about all the nerfs they did to high end bosses after I left enrages me. Me and my guilds worked hard to progress through that content at breakneck speed, and I know from personal experience, anybody who couldnt clear that stuff was an idiot. All it took was a little smarts and not having baddies in your raid. I tanked all of the druid tankable bosses in BT in almost full t4 level gear... BEFORE all the nerfs to these bosses.
While I understand that Blizzard wants everybody to see this content they worked hard on, I think it is rediculous to nerf these bosses THAT much. If I knew they were going to do that I wouldnt even have raided in the first place. I could save a BUNCH of time, and still see the content, athough I would miss out on all the time spent with all these cool people I raided with, and having fun downing challenging bosses before they were a joke. If they keep things as easy as they are now, EVERYBODY will get through it all and have nothing new to do, and just quit. I've seen it happen in the hardcore guilds I was in. We downed all the available content, and everybody got really sick of it pretty fast, so people started quitting left and right, or they rerolled, or they just went pvp.
That is why I'm going to be focusing on PvP this expansion. Raiding, to me, is dead. They can nerf bosses and classes all they want, but they can't nerf people, which means I can face off against challenging people all I want without worrying about them nerfing them.
I realize not everybody has the time to raid and all that, I fall in that category currently, but even if I did have the time I wouldn't be raiding right now. I know that I'll get to see the content anyways, because I know this stuff is going to be puggable sooner or later, if it isnt already.