I think the consensus is that the current system is significantly less than spectacular; there is no contention on that topic. The suggestions you made are pretty good.
Originally Posted by Luph
3) A rating system is put in place. I'm a bit skeptical of the "sort by general rating" but as long as it doesn't completely prohibit maps without a strong rating it doesn't bother me.
So long as map or mod can only be up-rated, this would work fairly well.