I'm not gonna hide the fact that I've used that site for hook ups, but if you use the site long enough, you're able to fish out the flakes and ignore the people that constantly post and actually find some sane, nice guys to meet up with. But you still need to be safe and be aware of your surroundings at all times and never reveal your home address.
As for other things, I tried selling my old Sims 2 games on there but no one ever replied, so I use eBay for that instead.