Mad genius, in my opinion.
No-one else does it quite like Lynch does; I even enjoyed Inland Empire, although I couldn't even BEGIN to tell you what it was about.
I've been working my way through the Twin Peaks Season 2 box-set over the last year, rationing myself to an episode every now and again because I just don't want it to end again.
I managed to get a copy of his post-Peaks series, "On The Air" last year after years of looking. I watched it at the time, and was always upset that they never repeated it again. It was comical, daft and pure Lynch.