My sister said pretty much the same thing. She pretty much gave up on internet dating because the reality was so different than the webpage.
I did not encounter guys who misrepresented themselves. Everyone I met was very nice. It's just that you can't pick up on chemistry through email. Or IMHO, on the phone. I felt some 'chemistry' or at least the potential for some with every guy I met in person, but once I met them, it wasn't there. No one ever called me for a second date, so I'm assuming they felt the same way.
Another important thing is to look at internet dating as catalog shopping. Don't take it personally if someone you contact isn't interested. And if you're not interested, just don't reply. The normal rules of social etiquette don't apply. I'm not saying to be rude (I know you won't be), but for myself, if I contacted someone and they weren't interested, I'd much rather they not reply than to send me an 'I'm not interested' email. Maybe that's just me. The important thing is not to take it personally.
I read another board where someone will make an internet contact and then go into a downward spiral because they guy didn't reply, wasn't interested, had a few dates but left his profile up, etc. Yikes. This isn't a Victorian gala ball (like the ball in "The Age of Innocence") where there are carefully coded signals and responses. It's much more rough and tumble... I guess like a mosh pit! LOL!