I've had a long-standing rule to avoid getting involved in any sort of crowdfunded activities. I didn't donate to Shadowrun or Wasteland, but I did buy and enjoy both of them (I'm plugging both of those games right now, just so you know they're good). I haven't...
Gameplay: The game works quite fluid but the AI must fart to proplell them at speeds not possible in those Go Karts to catch up when I am a lap ahead. The weakest point in the entire game is how much the game cheats. The game is quite agravatign if you get pissed easily.
Controls: They are good, but you can break off a stick pretty quick trying to power slide.
Graphics/Sound: Great, they mixed Pixels [worked better than Polygons for the Karts] and 3D polygons. The Tracks look nice but they are kinda bland. The sound is okay the music is annoying after a while and you cant tell what some characters are saying at times [did Toad say "Oh #### when he pased that guy!].
Multiplayer: This is where the game shines, you have battle mode which lets you fight using the items or you can do a 4 player race with your friends. This is why you buy the game, but get a big TV.
Replay Value: The multiplayer kept me coming back for 10 years!
Overall: Fun if you dont get mad easily, otherwise get the swear jar.