Certainly worth picking up.
Gameplay: Mushroom Men consists of everything you would expect from a 3D platformer. It pulls of the genre decently, but not quite on par with Super Mario 64, or banjo-kazoo, but still pretty good none the less. Mushroom Men also introduces new ideas such as fully customizable weapon system, but dose not take the idea far enough.
Graphics: Pretty good. Overall they look nice, but occasionally you will come across a back-ground object that is poorly animated and sticks out from the rest of the scenery. The character models are especially detailed!
Sound: The sound-track is clearly the best aspect of mushroom men. There are catchy and original tunes. The sound effects also fit pretty well.
Control: The control leaves a lot to be desired, due to the fact that the players motions don't register as often as they should. Otherwise, the controls are responsive enough to be bearable to the players.
Replay value: In terms of length, mushroom men is really weak. It is noticeably short and there is nothing to do after beating the game, which only will take about a week.
Overall: I recommend this game to anyone who likes platformers or needs a good Wii game that is easily accessible.