I'd be more bothered by the closed sourcedness of the movies and games themselves, than of the reviewing venue. They're still proprietary media products wherever they get reviewed. So I'd work on that first.
Huh, I was not aware that was released under a Creative Commons license! My first thought was of movies that have passed into the public domain, but of course there are CC licensed films.
I do like open source games, but that's a very different and unrelated thing to this. Whether the reviewed game is open source does not matter too much from the review perspective.
Are you open source ? I mean you as a person, do you give open access to all your datas by example ? If not, that bothers me. I mean how can you be a hardcore open source supporter, and not be open source too...