My all-time favorite would have to be Princess Mononoke.
and, in no particular order:
Serenity
Scott Pilgrim vs. the World
Shaun of the Dead
Hot Fuzz (best of the Cornetto Triology imo)
Nausicaä of the Valley of the Wind
Summer Wars
I really can't think of any that I hate.
that is, other than the last airbender
*shivers*
