Overall I agree, but I actually quite like the ending of the series. I've read lots of folks online who absolutely hated what ultimately happens to Roland - I thought it was a cool ending which was very much in keeping with the sort of "cosmic cycles" theme of the books. That said, there is a _lot_ of junk in those final three books, and the seventh one in particular drops the ball in several disappointing ways before it ends.

It was the best ending possible. The first line of the first book was what hooked me on this universe, so I loved reading the last line years later.