Does this idea of a chart to classify games comes in pair with Yahtzee's Extra punctuation "contest, challange and gratification" idea for rating games? Do you think it was discussed as a whole? Anyway, this is just a tool, it can't possibly cover all the videogames in this world. Definitions change over time, and label as "RPG" and "action/adventure" seems to be inadequate to definy a lot of games, recently. Finally it's not really useful by itself, since a review needs to elaborate on the game's content, but once you elaborate on it, you describe the game far better than by using the "tag" you place on its genre, thus making the creation of such a system a bit pointless. So, it's just something you have to put in front of the article to steer away people that wouldn't be interested in the genre, but this is already achieved by the "old" labels (of course, this is just my opinion).
In case I didn't make it clear previosly (I am sorry, I don't speak english very well), I think that both this system and the previous one are flawed, but get the job done either way (giving basic informations on what to expect in a game before even bothering to read a review), so I feel it isn't particularly useful.