For its current state right now:
Graphics: 7
GamePlay: 6
Sound: 6
Addictivness: 8
Each PW is like a mod for a game. The current PWs suck ass, just like most mods do
I guess we can only wait for a few decent ones to come.
The thing with graal is, those numbers can easily be changed in two second. Someone could use great gfx, create a nice rpg type PW for mass players, create decent music/soundfx to go with it. It is all about who will take the time to do that.