Right, season 5 was thought-provoking, and from my perspective they put a lot more focus onto Izzy, and I really liked that. I did NOT however, like the ending. This whole season was literally about their break up, and the script was well-written up and insightful into the aftermath of a break up. That is, up until the ending in which EVERYTHING in the ENTIRE series completely gets disregarded and invalidated.
(That is not to say that I didn't enjoy it, I did)