I personally like him, but his best work is behind him. Case in point: I'm reading The Stand (for the first time) right now.

IMHO, his best book was written in the 70s not even under his name. It's called The Long Walk and while not his usual supernatural gruesome style, it's still got this extremely haunting quality of its own. I sincerely suggest you check it out.

Finally, as far as epic series go, you can't beat The Dark Tower.