He has had a long career, but I can merely count a handful of movies that I enjoyed. Out of those few, only Dances with Wolves has any artistic value, but even that can be arguable. At times, it feels very self-indulgent, particularly with the 3 hours runtime. The success of the movie also fed his ego, and for a while, he pretty much had free reign to get his projects approved, which led to a couple of big expensive flops. I especially hated Waterworld, because to this day, Universal continues to try to salvage it, as it is now a live action show at its namesake theme park.
Plus, his acting never got any better over the years. He always plays the same characters over and over again.