Code Geass season 2, fuck yeah!
Don't know anything about the rest. I generally just wait to see other's reactions and watch the ones that seemed well liked. (there are a few exceptions, like Night Wizard's art style drawing me in even though it wasn't exactly popular)
I've gone off of trailers in the past, but a lot of times, the trailers either make them look much better than they actually are or don't really do them justice.