As a gamer I think your section division makes a lot of sense! And as far as I can tell, it'll still be good even if you don't have that much to say about a particular game - you can just leave out sections that aren't working for that particular example.
I don't really have much to offer regarding the categorizing since I'm not a well-versed editor. But I guess I'd start with medium-specific categories, for example: games:rpg or games:larp, subdividing in this category once a critical amount of pages has been reached. I do wonder how one would treat a thing that is a whole franchise spanning different mediums.