There will always be undesirables in most online dating/chatting services. Gay.com is one the largest, thus will by default likely contain the most pervs. Personally, I have dated a couple of guys I have met on gay.com. Both were truly good guys. It's not impossible, just takes patience and of course a little bit of wit to weed out "The Disturbed Ones".
Although, I will go on record as saying I have already had more comfortable and enjoyable conversations with guys here at RJ than I have at probably any other social networking site. I definitely was not expecting such, but thought it was worth the try. I'm glad I did. There is a more relaxed atmosphere here where I can chat with guys who are in a relationship and maybe even make a ::gasp:: friend!
As far as relationship possibilities go, it's just safer to never put major stock into getting that from any site. But there will always be the "ya never know" factor.