I've encountered a lot of great stuff because of RPGFan that I wouldn't have otherwise. I think I have to put the Disgaea series at the top of the list, not because any of them is necessarily the best game I've ever played, but because I had never heard of it, and thanks to the site, I think I've played every game in the series at least once. (I reviewed both the PSP and DS ports of #1, and I reviewed the PS3 version of 4 and am about to start work on the Vita version.) That also led to me playing ZHP, which I loved, and Mugen Souls, which I enjoyed, and probably some other good games as well.
And lots of swell people, of course. :)