I totally agree with you. Everyone would hope that their jokes go over with as many people as possible. But you can't take it seriously. Think of it like Digg or Reddit for webcomics. These people are channel-surfing the internet. Their value judgements ultimately mean nothing from a crticial perspective. It's just exposure. And that's not a bad thing.
I know it's tempting to look at the rankings, but I think you're better off having your comic on the list and then never looking at it again. If it brings you more traffic, that's really the extent of the exchange between the creator and the site.
[url=http://tinyurl.com/6nao3v]THEATER HOPPER -::- Comics about movies.