I have, but it's very rare. The few times I can remember using the Discovery Queue they were all games that I really had no interest in. I've found more games that I didn't know about by reading about them in the PCG magazine or an article on the web site, then looking up the game itself on Steam. I think it's a nice feature of Steam, and probably useful to gamers who play varied types of games, I've just got a pretty narrow focus of what games I like.