I think he did the right thing, the story was like he said "seemed like just filler". We never like to see things we enjoy end but Kirkman did the Walking Dead a solid on this exit. Everything was wrapped up tight and all the bases covered. I would have liked to see the "old man" Negan but I think he did that on purpose for the reader's imagination.
The issue had me feeling satisfied like at the end of some movies where they tell you what happened to the characters after the curtain closes.
I've been reading TWD on and off pretty much since it began. I only just caught up to where Rick was shot so I really only had to wait for the last 2 issues.
I think it ended in a good way. It was funny as I didn't realize until the last page that I was reading the final issue, but for most of it, I felt that this was a fitting ending (for me at least to put the series down). It wasn't like I was dissatisfied with it, just that it had run it's course. I didn't need to find out what happened next (kinda like in the TV series where in my experience, the show ended with Carl revealing he was bit.)
The story had been told and anything more would have been a rehash of an existing story arc. We got the closure.
The only thing I would have changed would be hearing Negan mumbling"****ity****ity************" at Lucille's grave.
I know this is old news, but I just finished reading TWD TPB #32, which reprinted the last issues of the series. Wow! For what it's worth, I actually didn't realize that this was the final Trade until I got towards the end. I get these Trades out of the library, and have never followed or collected the floppies - and had forgotten the # of the last issue.
Excellent final storyline(s) involving Rick & co. coming upon another community which included a lot of disgruntled citizens, and then narrowly avoiding going to war with them. This was an unexpected plot twist, and something that surprised me - though I'm glad this happened the way that it did.
The sudden, unexpected killing of Rick Grimes by the spoiled, entitled Sebastian (the son of the town's Mayor) was extremely jarring, and not something I saw coming at all. When Carl (Rick's son) had to eliminate the Rick Zombie the next morning, it was quite sad/poignant.
I also felt it was a great idea to have the final issues take place about 10-12 years after Rick's death. Carl & Sophia had married, Michonne had become a local judge, and the zombies had been all but eliminated - though they were still a threat in some places. This was a fantastic "epilogue" (for lack of a better word), and a nice way to end the series.
All in all, this was a superb series. I always felt it was far superior to the TV show (though I still keep up with the show & also Fear the Walking Dead - to some extent).