I LIKED IT.
I'm glad that this wasn't the same old same old Rigby does something stupid, mordecai trys to stop it but makes things worse, and everyone else fixes it scheme. It's funny everytime but this actually had some nice character development from one of the least centered around characters. (imo)
I also liked the idea of Rigby--the wimp-- finally being able to have a break from all the punchies he'd been getting lately XD