DeLuca is creepy and I don't see his relationship with Meredith going very far, at least that's my hope. I'm firmly in the anti-Derek camp, too, and in fact despised Derek and Meredith and, as somebody else said, watched GA because of other characters, specially Christina and Bailey.
Owen is always about an inch away from an emotional blow-up. Amelia is now the grown-up in the room. Maggie, of course, needs to be consistently an adult.