It feels less arbitrary when you have a lot of different people looking at what you made, all of whom also just spent 2-3 days tirelessly toiling on their own projects.

Fair enough, but the fact it can be arbitrary is not my fundamental issue. Why does it need to be judged at all? Why can't they just say "Cool, we all made a game!" and then leave it that? What is achieved by having scores, and bearing mind a lot of ppl are going to be disappointed by bad scores, is it worth it?