Never played rift, and don't plan to. I haven't seen anything or read anything that would make me want to switch over to rift. The reason theres so much haters is because your trying to promote a "wowkiller" on a WOW forum.
The op mentioned how it is so different from wow, then goes on to say a group of 30 people to kill some very strong monsters. Sounds familiar to me. Kinda like 25man raids in wow? Like someone mentioned earlier, only different thing is rifts and talents/classes. And rifts aren't even that impressive. They're pretty much just spawn points with flashy animations that appear randomly.
On the other hand, I did hear of an mmo in development that will be about zombies. Essentially you play as a survivor and must rebuild the world with other survivors. Gather supplies, build, survive, and repopulate i think. Something like this, that isn't trying to be a cheap knockoff of wow, is the only thing I would consider switching for.