Great idea, but I totally disagree with your design scheme, especially if you're targetting an older audience. I'd say go for something a little more professional, rather than spew the fact that you love Half-Life.
If this site is to be read by parents of all ages, I would cater to them by creating an easy on the eyes, professional and sleek looking site. I would also work hard on the layout and functionality of the site, to ensure that it's easy to use and easy to read.
As for the idea itself, I think it's awesome. A lot of parents are pretty retarded when it comes to games, in the same way that they were retarded when movies got more violent, or when the VCR became popular.