A few parts were a little over-dramatized ("And Hell's coming with me!"), and the whole thing was pretty Hollywood-ized (although the director has been quoted that all lightning and all mustaches were real), but overall it was entertaining and it's worth watching for Val Kilmer's character alone.
Just a little fun fact: this guy (from Tombstone)
and this guy (from Avatar)
are the same actor. Shocking, I know.
(photos collected from imdb, and googleimages)