We've just finished watching the end of season five of Scrubs, and boy, do I hope this is the last season. (Unfortunately, it's not. IMDB reveals that season six started on 30th November). I don't know what happened between four and five, but the quality has dropped considerably. It's gone from being very, very funny to raising a smile at best. Several episodes were embarrassingly bad, some were just plain stupid. Most were just plain dull.
And the heart's going, too. I think they're struggling to find meaningful revelations with which to close the episodes.
And it doesn't help that, while everyone else is at least growing and changing a little, J.D. continues to be an embarrassing, self-centred jerk.