Heh, if I knew the answer to that I'd have an account value a lot higher than $0.50 after two months!

Seriously though, there does seem to be a niche for just about everything. I'd keep posts shorter rather than longer. I'd try to post only once every day or two. I would comment a ton, especially on topics that you yourself would like to write about. That will help you form connections and gain followers, which as far as I can tell is the best way to be successful on here without resorting to anything that costs money.

I like your idea! There is a fairly decent gaming community here from what I've seen. Just make sure you pick 5 good tags so people can find it! I like picking 2 or 3 of the very common tags (in your case, something like "gaming" and "pc" and "review") and then 1 or 2 more specific tags, like the name of the game (and maybe the abbreviation, like "CoD" or "SC2" or "WoW"). That'll help people find your content more easily.

Best of luck!