I think it's a good idea, although I do know the gaming niche is a bit difficult to compete in (at least with my experiences).
One idea I know you could do to attract potential visitors is livestream games on a streaming service such as Twitch.tv. Perhaps, since you're doing co-op games, you could even invite members of your audience to play along with you. I've found that gamers tend to be quite loyal to their favorite websites and brands, so if you could focus on the community aspect, maybe they'll become loyal to you.
Best of luck!
I have an addiction to starting projects. Therefore, it's not worth listing a site here, because I'll probably be focusing on a different one next week!