I've been doing gaming videos since January, so take this for what it's worth as I'm obviously not a long time reviewer.
Your video quality is great. At some point you will want to go to 1080p, but it's not that important right now. You're probably using FRAPs or something similar and are already cutting the quality down in Vegas/Premiere etc so changing up to 1080 is easy. You're getting a bit too much of the vacuum flange sound with the microphone. The quality is good, but I would almost wonder if you may be using too much noise reduction. If you are using noise reduction of some kind then perhaps try toning it back a little bit. Should make the audio sound a little less processed.
Beyond that, I'm not really in to the military shooters however it does sound to me like you know where you're going. You may want to diversify a little bit though.