Overall a pretty weak lineup in my opinion, especially the headliners. Calvin Harris? Skrillex? Yikes. Eminem and Kings of Leon aren't my cup of tea but I think they are decent choices. Arctic Monkeys and Outkast both should be good shows.
I went to Lolla in 2010 and had a blast. I don't know if I would go back now, every year it seems the lineup is weaker and weaker. I don't know if my tastes are just changing or the festival industry itself is faltering, but it's an interesting question.
I find the lineups at the major fests, ACL being the most relevant to me, are staying relatively the same (or possibly succumbing just a bit to mainstream hip hop) while my tastes get more and more esoteric. So I'm harder to please and the fact that I enjoy a fest like ACL less is probably my fault. Also, they big four are too damn big. I went to LouFest last year and got rows 1-5 for every single band I wanted to see, no problem. Never had to wait for a bathroom, didn't have cops harassing me, food was cheaper... and I saw a half dozen amazing bands and 15 more that were passable. Made me question all the times I've dropped $200 on an ACL wristband. EDIT: oops I wasn't following you :< EDIT2: if anyone is going to Lolla, one of those half dozen incredible bands from LouFest was actually Space Capone, who I notice are playing. Go. See. Them.