So very recently I've been getting viruses from this site, or hacking attempts. Yes, I was playing games on here when out of nowhere I had my credit card info presumably stolen. So far the effects of it have been mimimal, at most, but that doesn't mean I won't put this up as a warning.
Unless you have a very good anti-virus system, keep away from the popular games ranked E-T. I'm not sure about the M ranking, but I know for certain the A ranked games are safe (yeah, the porn games are more safe than the children's games; weird world).