The Shining is poor, but I’m biased as I find horror a bit dull and I was also annoyed that it didn’t follow the book very well at all (I loved the book when I was a kid).
I’d add As Good as it Gets and About Schmidt to the list of great films of his. Chinatown and One Flew Overt he Cuckoos Nest are easily his best mind and two of the best films ever made.