Why do people like Dr. Doom? I don't like the Fantastic Four, so I haven't read many comics with Doom, and I'm wondering why he's so popular as a villain.

From what I know, the comic version hates Reed, is quite powerful but also convoluted. Plus I think he talks in 3rd person (not sure).

What do his fans like about him? What don't his non-fans like about him?

Also, what exactly are his powers?