I don't want to harsh on it too much because it's an early version and art is subject to change. Placeholder models are a thing because they are quick to make and allow you to focus more time on the parts of the game that the player feels, rather than what they see. Art should be in it's final style after all major systems of the game have been decided upon and the basic skeleton of the game is built. Until the game is in a more clean up state, it's fine for the art to be temporary (Especially since an artist is likely to change the vision of what they want over the course of a project even if it looks good).
That all being said, I can't stop laughing about how scuffed that model is XD Practice makes perfect, so if you're planning to make your own, don't give up because people might clown on your model. Most of it is in good fun, and the ones who only care about how a model looks probably wouldn't care much for a game anyway. There's plenty of resources to help with developing better models and anatomy study is a big part of becoming more comfortable with art, 2D or 3D.
And if you find that your time is better spent making the game itself better, you could always hire an artist or purchase other people's models if you can be financially invested in you game. Good luck to you, and remember to have fun