I was curious to see this western adapted from a Robert B. Parker book and directed by Ed Harris, and while I liked it, it was nothing to write home about. Ed Harris and Viggo Mortensen star as a couple of marshals hired to capture the guy (Jeremy Irons) who killed the previous Appaloosa marshal and his deputies. The movie is very slow paced, but the acting is really good, and the relationship between Virgil Cole (Harris) and Everett Hitch (Mortensen) is definitely the best part of Appaloosa. Harris and Mortensen display a riveting old camaraderie, and it is impossible not to believe these two have known each other for years, and they know exactly how the other one thinks. Great acting, really.
So, if you want to watch a western with little to no action but with solid performances, rent Appaloosa. If, on the other hand, you're looking for lots of revolver action, then you should look somewhere else.