Alot of the negative reviews, i get what they mean. I watched quite a bit of gameplay footage before buying the game, you should too if you arent sure if you wanna buy the game or not. Biomutant isnt for everyone thats for sure. The game has ALOT to explore, and you definetly should do that exploring so you get better gear and what not. You have to like these types of games, if you dont mind a bit of repetetivness, the narrator narrating almost everything you do, then this game could be for you. Lots of ppl dont like the narrator and i can understand why, but i personally find that it adds a little somewhat to the game. For the devs the narrator was a hit or miss kind of thing to add, and personally i think it was a "hiss" (bit of both). After 32 hours i can say, i really enjoy the game so far. Im not even done yet, due to the sheer amount of side quests that this game has, i only beat one of the 4 bosses so far.

Short summary:
Its a great game, the only thing i would say thats a bit off putting, is the fact thats its being sold at a AAA price. If you were to critique the game as a tripple A title, its lacking alot of stuff.
But for what it is, i cant say that i regret spending that money on the game.
All in all, its alot of fun, with ALOT of stuff to do.