This Isn't Too Bad
What this really would need is a more streamlined look. (Some of the graphics look a little pixel-y) Just having the same color as the team fortress game isn't really enough in my eyes. So a nice overhaul of the menu/guide wouldn't be half bad.
Most importantly though, some music would have been nice. Reading is all fine and dandy, and I know that some people read better in silence, but silence can only keep a majority of people entertained. So in further installments music would be a good addition. (Plus the ability to mute it just to appease those that would rather read in silence.
Other than that, great job. If I had ever played TF2 I may have had some conflicts with the guide, but since I haven't; you taught me well.
Keep up the good work.