I thought that was the best episode of this show in a very long time. And as a huge Cristina/Sandra Oh fan, I though it perfectly showed her reasons for eventually leaving SGMW/the show. I have never liked Cristina and Owen together, for all the reasons this episode made perfectly clear - they are just not good for each other, they want different things, and if they stay together, it will hurt both of them in the long run. I'm glad that, at the end of the episode, it looked like Cristina had finally realized all that as well. I'm especially glad that it looks like they're going to send Cristina away from Seattle, possibly back to Mayo, possibly elsewhere. I'm with omgsowicked - at least she's not going to get hit by a bus (*poor George...).
