I feel bad rating anything less than 5. Indie creators need love, and I'd be crushed by like a 4 star, so ... 5s all around!
The rankings in the jam don't affect the game's overall ratings. The only person who will see the overall results are Ash. It's also not asking which games are good or not, only what would be best for the jam. By ranking EVERYTHING 5 star, you're only making things a bit more difficult for the person running the jam c.c