My #1 pick goes to the French Kicks. Ive seen them more times than I should have and each time it gets more painful. Unfortunately they end up opening for some great bands so I just suffer through them hoping the torture ends soon.
The Rapture - for a band with so much hype, my friend and i left the show early so disappointed (actually we didnt leave - we just went to the downstairs bar) - they were so upstaged by The Presets.
Vampire Weekend - Ive only seen them once - pre-hype - and they were the most boring live act Ive ever seen. All their music sounded the same, but luckily there were 2 other bands playing after them.
The Fratellis - oh how i loved that album, might have been an off-day at lolla, but just wasnt feeling it.
Silversun Pickups - another album I really liked - and it might have been the venue's problem, but couldnt make out what a single song was.
and The Secret Machines - I used to love them live, but after last time - that's it. I left the show early wondering how they had changed so much from their previous shows.