7.5 makes no sense...
I read in another article that talked to the designer of the game, why it was not for the PS2 and he mentioned that it allowed them a lot more room to make larger levels for the game and allowed for more voice acting (which they failed to mention the fact that there is a whole lot more dialogue). Not to mention the ability for downloadable content.
If your only problem with a game is the graphics but everything else is outstanding you are not making a strong case for yourself. Cosnidering the graphics aren't even terrible, the score given does not make a whole lot of sense.
I bet they won't mark down Chrono Trigger for the DS when that isn't updated with full 3D, which we know is entirely plausible since they have been doing it with the Final Fantasy series...or at least CG cut scenes...