When I watch it I don't think of it as a cinematic masterpiece or anything, but it's also one of the few movies where if I saw it on tv I would probably sit and watch all of it.
So, I don't know f that answers the question. So many amazing performances, and not just Kilmer. I am not even the world's buggest Kurt Russel fan but he was great. Paxton was great. fukking Michael Biehn was great. Sam Elliot and Powers Boothe were great.
At the end of the day, great movies are good scenes with good performances that you remember, right? If so, it's a good movie.
I sort of feel like there are "films" (think Godfather, No Country For Old Men, Drive, etc.) and "movies" and Tombstone feels more like a "movie" if that makes any sense.