Ooh, I'd totally disagree with that. Aonuma started with MM, correct? I would not call that simple whatsoever. It was probably the hardest Zelda game to date. Here's hoping they make a harder one sometime soon.
I really have no problems with Aonuma. MM was a great game, and WW, TP, and PH were pretty darn good. My only problem with him is that he seems to be heading more towards easier games, as all of the ones he worked, except for MM (which was extremely hard) have been quite easy.