If the cache is good, then hopefully more people will mark it good. That's all I hope for. If you for some reason suspect that the rating is flawed, then you don't need to use it. But if you think it's relevant, then you can.
If this feature is implemented, you can still read all the logs if you have the time.
And, what is stopping immature people from posting logs saying that a cache is bad? If people are out to do bad things, what's stopping them from seeking up caches and trashing them?
Remember, my suggestion is that this should be a guiding tool. I don't want it to be a beauty contest.