Also, another brief thought:
I know that reviewing all depends on that person's opinion, but perhaps the scores could be calculated partially depending on the reviewer's average helpfulness and/or points. I mean, since the points/helpfulness represent how the community likes their reviews, then perhaps their reviews could factor more/less into a level's final score. Not by a huge amount, but just a little bit. Then again, if the points already do something like this, feel free to correct me, as I couldn't find anything saying so.