I think they handled Burke's return perfectly. The chemistry is still there, but he's grown up and moved on, and Christina has as well. Unlike most people, I love Owen, but she's going to leave him behind. So sad but medicine is her one true love. I'm betting she will take Shane with her (as they've mentioned he's leaving the show.)
WTH didn't Jo ask someone for help when she screwed up!? Calling Alex doesn't count! I did like seeing him being happy and successful. He deserves it!
Bailey, Bailey, Bailey. I know why you did it, but you are so screwed!