I think it's going to be fine. I mean, the situation is different than what it was in Alias. It's not like she's there to cause trouble for Shepard and Meredith (and Addison did that but people still began to love her) and she mainly goes there because she's Meredith's BFF, not someone's wife ;) At least that's how I see it. But I only know general spoilers so far.

Definitely. It's going to be so great. But in a way, I sort of wish she did more movies. Sort of.