He's original and unique but very film-literate; his visual style draws a lot from 20th-century European and Asian film, and we don't see a whole lot of that.
His movies are incredibly detailed and are simply terrific to look at; the costumes and sets are always impressive. They're beautifully shot. The musical choices are dead-on.
His casts are uniformly wonderful.
The movies are really funny.
And, for me, my favorite thing is the way that he creates worlds that are incredibly artificial, effete, and mannered. That's by design - in the third act, he creates really genuine and moving moments that turn out to be well-earned. It's sleight-of-hand.
I think that some of the things that I just listed as great qualities are the same things that turn people off.