Wow, I didn't know there was this much Tim Burton hate. Edward Scissorhands and The Nightmare Before Christmas are some of my favorite movies ever.
He's 50-50 in my book. I enjoyed the two movies you listed, but I disliked his take on Batman (I know I'm in a minority here) and Charlie and the Chocolate Factory. Planet of the Apes was absolutely abysmal, Sleepy Hollow bored me to tears, and Ed Wood was only occasionally entertaining.
When he's doing an at least semi-original story it tends to turn out fairly well, but most of his adaptations have been God-awful. Alice in Wonderland would be an adaptation. Hence the "meh" attitude from some.