Thats true even I've seen a few games which are good but haven't gotten much ratings. I feel that even tho ratings comes under "being competitive", the number of ratings would directly coorelate with the number comments and hence feedback. And jams and mainly about fun and feedback and learn in and improving. If the genuine people don't get feedback then it's a failing system...
But on the other hand there are also ways to make sure your games get ratings. I'm not sure about this jam but in ludum dare if you rate others' games you are sure to get ratings for yourself. Another way is being active in the community. And that works in this jam too obviously. I hope that the issue of bits don't undermine the good thing we have here. There should be ways to ban or avoid bots right. Jams are really fun and I've just started jamming. Hoping to keep doing it!