Unlike 99% of the English-speaking population of North America, I have some familiarity with the French "Lucky Luke" comic books. The filmmakers of this cinematic adaptation managed to get some things right. The production values, for one thing, are top-notch. The locations (the film was shot in Argentina) look gorgeous and look like the American west, and the sets are elaborate and eye-catching. Also, the actor chosen to play Lucky Luke was a good choice, looking somewhat like how the character appears in the comics, and has some natural comic talent.
Unfortunately, despite positive points like those, the movie has some serious problems that make me unable to recommend it. For one thing, there is barely a plot here, and things are stretched out to last 105 minutes. There are also some inconsistencies, like how some signs are in English, and others are in French. But what really sinks the movie is its tone. The comics were breezy and amusing, but this movie for the most part plays out in a surprisingly bleak and dark manner. There's no joy or amusement here.
Even if you are curious about how France tries to compete against Hollywood blockbusters, I recommend that you skip this movie and try something better, like "The Crimson Rivers" or even "Don't Die Too Hard".