yeah if you look there are definitely some naughty comics on here, some have parts blurred but others don't. I agree with Aztek, if it is a comic, it should be here. I think you should just censor the covers or character pictures (if there aren't any that are clean)
I think that ComicVine should create official rankings with scales 1 to whatever (like the old Marvel Comics cards). Make forums and have those that really know the hero/villains feats place them on that scale. Then post it on the characters page. That sounds like the best and most fun way to do it.