Here, watch some of this guy's reviews: http://www.youtube.com/user/RedLetterMedia
Look around on YouTube and search for more reviews. Compare professional video reviews, like those published by IGN and Gamespot, to amateur ones. What do you notice?
1. The good ones know that they are working in the medium of video, and so they use a hell of a lot of moving clips. Static shots work in Zero Punctuation because it's a cartoon; you are making a video, so you need to use moving clips. (This is one of the major reasons why MovieBob is so awful.)
2. The good ones know that they are reviewing something, not making a vlog. There are fewer things more boring to film than your own face in front of a webcam.
Remember: if you're not going to make it visually interesting, why aren't you just writing it down? Rely on your clips from the game much more than your own head. I don't know who you people are, and I certainly don't give a fuck about you, so why would I watch a review that showed me more of your face than of the game your video is supposedly about?