Previously: Ravious’s comments
An FPS with Diablo-style quests and loot set in the weird west. You go to the planet Pandora in search of the mythical Vault. You spend most of your time gunning down bandits. Everything has a bit of attitude.
A playthrough is on the order of 20 hours. You can shave off some time by skipping side quests and being less cautious than I was, but there are limits. First, if your recklessness gets you killed, you lose time. Second, there are levels, and skill will only get you so far if half the map can one-shot you. If you want to keep playing that character after opening the Vault, you can start more playthroughs, starting over with higher level enemies.
I am not a great connoisseur of FPSes, but it gives you fun ways to shoot things. It is neither realistic nor cartoonish, just a bit wacky. You can play 4-player coop, but there is no shooting at your friends beyond dueling. It is fun, although I do not know how lasting the fun will be after you have shot 100 of everything.