Why do we bother even talking about this? Seriously.
As was said (I think by Kajun), this site is intended for COMIC CREATION. Fast. Simple. Requires no talent to put a strip together.
The fact that there seems to be more and more crap probably springs from the fact that more people know about the site, so more and more new faces are showing up. Not EVERYONE is funny. However, with the slew of new users, many genuinely creative people will show up. So honestly, quit worrying about what's going downhill or how nothing is funny anymore.
I was here a year ago, made a few crappy comics, and left. The site was cool, but I didn't think much about the comics. Some people were funny, sure, but overall I wasn't just grabbed by the content on StripCreator. Recently I came back out of curiosity, read the forums, read the comics, and really enjoyed what I saw. I tried a little harder, and now I have a few fans.
If anything, I think this site is getting better. StripCreator is only going to be what you make it. Take it for what it is, a comic-creation website, and then just appreciate the extras: a forum to create friends, people to talk to in IRC (doesn't have to be officially hosted), and just a place to do crap all day when your boss isn't looking.