I thought last week was amazing, but this one...I can't decide if it was better or what...an all Derek episode was a smart idea. It's a character I'm very fond of. Even though last season he had that pregnant woman storyline which almost led him to drop medicine, he is the center of attention this time.
Lexie is now a character I really like too, every week she keeps bringing good performances. Meredith had more screen time I think, and it was worth it. When they are in bed talking about the tumor and he draws in the wall, I loved that scene. It's great to see what they have become.
Lastly, Chandra Wilson's direction, nicely done! She did a good job.
I can't complain about this season, the way they are experimenting new things...so far it's been awesome.