Really enjoying this game. Yes, it's one of those open world games where you just go around completing different versions of the same types of missions, but the gunplay is so smooth and satisfying that it's fun to just go around kicking ass and clearing out hostile bases. And I like that everything only takes about 5-10 minutes to complete, which makes for smooth pacing. You never get that "Uggghh another one of these I have to spend time and go through" feeling that I would get when coming across one of the 200 dungeons in Elder Scrolls that take 45 minutes each.
Also, one of the common complaints is that the world feels empty, but there's constantly different factions fighting each other all of the map with explosions and gunshots often heard and seen in the distance. Makes you feel like you're in world of anarchy as the game advertises. Not to mention there's good variety in the game world from deserts to swamps to canyons, etc.
So yeah, the game provides a simple but effective formula, which is refreshing among the usual overly dense and drawn-out open world games. My only complaint (besides the bugs) is the significant effort to make everyone in the game ugly. Doesn't fit with the overall fun vibe of the world and comes off very forced.