Very slow-burning books, and I almost always lost interest before finishing them. I found The Dark Tower especially tedious. After I couldn't force myself read it, I got the audiobook version a lnd tried to listen to it three times, but always fell asleep. Ironically, the books I genuinely enjoyed were some of his longest ones: It, and The Stand.
As Richard Bachman, on the other hand, he wrote loads of entertaining books. It almost seems like in that persona he didn't give a shit what others thought of his works, and the books ended up eminently readable.