Fuck the ratings
Know what? We don't make games for numbers, we make games for people. And no matter how bad your ratings are, some people out there enjoyed your game and thats all you should care about.
I think ratings are like the grades in school, it doesn't tell you how good you are, it just gives you a reason to learn and here it's a reason to play other games. Who would sit down and play games after the jam is over, if there wasn't a rating system?
So if you think your game is awesome and you think about making it a commercial game but the ratings are just average - go for it. Chances are your game is awesome. And you shouldn't obey some numbers, you should only obey you.
PS: not talking about my own ratings here, they are fine, just don't waste your ideas because of some numbers - there are lots of brilliant games out there, if you didn't make it to the top 100, thats no reason to throw a good concept away.