Yeah, I came over here from GameFAQs. If you join a discussion on your favorite game, you can get a lot more out of your game. You might get some additional appreciation for the story, or pick up a new way of playing, or just enjoy a good fat chewing session about it. I particularly like helping the newbies learn the ropes.
Depends on the game though. Some have next to no following anymore, but most games have a small following. The more popular games you'll get a bigger discussion group. On the whole, people are pretty good about things, same with here, same with anywhere. You're dealing with fans of a game here, but if you're a fan, you should fit in fine. I recommend it if you have any particular game in mind.
One problem I found, was you get some crazy challenges to do. So, I was on the FF XII forum for a while (ergo my name) and I enjoying really challenging what I could do in the game, like play through it solo level 1. But after a while you get some really stupid hardcore ones, like 100% perfect play through or don't ever heal yourself.
Reason I came here though was some of those challenges were a bit much and I like playing games *other* than Final Fantasy XII. Additionally, I've been visiting this site for years, but never engaged on the forums, gave it a shot, and can't complain so far. Well, I can, but I'm pretty satisfied overall.