I've been watching the show now for 4 years now, and every year they let really bad acts through to hollywood, and they throw away some of the best acts there.
I really wanted the bald singer to get to hollywood, but they thought he wasn't good enough, and yet they let the talking bird in even though it had a terrible audition.
But from all the seasons I watched, my favorite acts would be Nuttin' But Stringz, Terry Fator, and Grandma Lee.