When you add humour with actions, the result is surely fun.
Redneck's theme is not-so-new: the aliens are taking over the farmlands in the redneck region and have kidnapped the buddy of gun trotting hero of the game. You start from rescuing your buddy (and thrash him with an iron bar to stop him from creating nuisance) and then move on wiping out the aliens.
The humor level of the game hovers around the main character's wisecracks, his inclination for booze and wacky behavior of the aliens. Definitely these are not as funny as in any of the Monkey Island games, but I would put them at par with the MDK's level. The game was initially released on DOS mode, then they put a direct X version. I can't remember which one I played-- but surely the graphic quality is not comparable with that of today. It goes in competition with Duke Nukem 3D and falls behind MDK.
The redneck characters tease the stereotype hot-headed Southern US culture-- but not deeply enough to make it a political statement. Surely this approach was used for fun. The shooter is enjoyable from the beginning to the end, and at no point of the game you will lose the interest to find out what's next. Like Doom, the lead character has a status bar that tells you about your health and inventory. Plus when you take a drink which works like a steroid of Duke Nukem, there is an indicator telling you when you are drinking too much. The fun part is, when you are too drunk-- you will walk backward and shoot like crazy. The bosses of this game are also fun to kill-- including the one that loves to stay in mud.