I don't think any less of people who use those sites. I HATE bars (for dating)... always have, always will. I don't want to be with the type of woman (read: skank) who spends her nights in bars - and I don't want to be the type of guy who does, either.
I'm married, but when I was in college I encountered ONE woman (in a bar) who was respectable enough to justify calling a few days later (but she wouldn't stop blabbing about her ex, so I nipped that sh*t in pretty short order). Anyway, if I was single, I would have a helluva time meeting women. It used to be that you would join a gym, but it seems that the gym has become the new bar.