You know, I actually liked the last season. No, it was not as good as the other seasons, but when I add the handicap for it basically being the first season of a new show, it held up ok. I would have kept watching had it been renewed.

But I understand where people are coming from when they compare it poorly to the other ones. The original Scrubs was a growing up story about JD (and comrades to a lesser extent). The last season was more straight sitcom, less story arc. It wasn't attempting to be as meaningful.