Under was extremely long and so-so. Like every King work it had amazingly memorable characters like Baawwwbbiee and Big Jim Rennie.
I liked it and it's ending was ok compared to a lot of his works. I'm sure you could take that incredible set of characters and create something amazing. We'll see, he's definitely sold a lot of his properties away to be crapped on.
Oddly, I felt like Cell was one of Kings more marketable movies in recent years. Really good and fits into a popular demographic.