Let's see I've seen
Kings of Leon- put me off them entirely...for good
Kanye West- about what I expected, wasn't as a big an a$$ as now though. I sat through his set 3x.
Black Eyed Peas- surprisingly solid. They brought the energy to the Vegas desert and it set up the rest of the night properly
The Fray- God, it just wouldn't stop. I wasn't sad I spent 90 mins in the merch line (four booths on the concourse for 50,000+ people...nuts!) in Edmonton, missing the entire set. I had to hear it, however.
So, no to the Fray. No, also to Imagine Dragons, Bastille, Coldplay, Mumford and Sons