BEST:
Danko Jones, they're awesome, especially live, they did a double encore and the crowd was still screaming for more, but unfortunately the drum kit hadn't survived all the rock and roll.
Incubus, only because they're one of my favorite bands, they didn't play astonishingly well and the audio system on that stage was very crappy.
Jon Spencer Blues Explosion, not much blues, but a lot of explosion, great music, lot sof energy, especially when Jon smashed the microphone and threw a box of the stage.
Hawksley Workman, first he played on a big stage, which was great, than he played on a small stage which was even more amazing. I was on the front row, about five feet away from him. Too bad hsi guitar brok down, but he still did four of five amazing songs and I got his autograph afterwards. He even drew a (childish) picture of his house.

WORST:
Nickelback,

A, I'm not even going to try to describe how terrible they were.
Custom, I had expected a lot more from him.
Other bands we saw: Zornik (good band from Belgium, kind of like Muse), Silkstone (great Dutch band), Jaya the Cat (funny), BRMC (solid), Rival Schools (not bad at all), Flogging Molly (Irish folk rock), Cooper Temple Clause (good), Jagga Jazzist (very cool way to start a day). Dimmu Borgir. Motorpsycho and Peter Pan Speedrock (and probably some more).