Things I liked:
Mike Chang's abs (who said I wasn't shallow?)
Quinn returning to HBIC
Finn's Cheerios audition (thought I would die laughing)
Becky judging Cheerios auditions
All the songs
Artie wanting to win Tina back

Things I didn't like:
Sue and Shue becoming frenemies
Santana's boob job
Rachel being THAT evil (not believable, IMO)
Finn being kicked off the football team
Sad Stalker Artie watching Tina and Mike dance