I've actually liked all of Peter Jackson's movies I've seen, but he definitely does have bad habits that really do need to be reigned in. I think he's one of the directors who tends to give in to his worst habits when he's given complete freedom, which definitely seemed to happen with The Hobbit trilogy.I enjoyed the Hobbit films well enough, but I think they pale in comparison to LotR (though there are portions of LotR that aren't all that hot, or that haven't aged well), and I also think stretching them to three movies was a dubious decision.
Ironically, though, I feel the extended edition of Five Armies is superior to the theatrical cut. Go figure... It's almost as though when they needed to cut material, they cut the wrong material.
Really though, I feel as though if you go from LotR to King Kong to Hobbit, you see Peter Jackson's directing gradually giving way to his own worst impulses.
That said, I did still really enjoy the movies despite some issues. They're not at the level of LOTR, but they still had enough great things in them to counter Jackson's excesses.