I might be getting confused here (I'm a casual fan, not a Dr Who expert) but I think I have an idea:
He's the writers who's made the series much もっと見る complex. Before, あなた had mostly episodic plots with one story running through a series. Now, あなた have story lines lasting for 2 または even 3 series. I think some people miss the old format. Also, this new format can be confusing for casual ファン (like myself, but I don't personally hate Moffat for it), since they don't rewatch episodes enough to remember every detail.
I don't hate him I feel he has made the 表示する better. Most hate him because he came 秒 he changed the 表示する up and made it もっと見る harder to follow. Also most ファン that hate him loved the 10th doctor so he left just about when Moffat took over. Also people feel he is sexiest.