“I am one of those who think the movie would have been boring if not for Doc Holliday.”
You are not alone in that view. He (Val Kilmer) made that movie in many of his scenes.
https://www.youtube.com/watch?v=VTrxTOFxA50
https://www.youtube.com/watch?v=R8OWNspU_yE
That and many other films. Too bad he's gone to seed and appears out of the business. A great actor!