I'm not that much on D&D either, but GG did much for RPG players in general. He is kind of a first stone in the cathedral you know, symbolic and all, that's why I'm offended with what DD4 is. (some kind of MMO crap, to me at least, seeking 'perfect balance' whilst killing the fun. Pen & Paper is just not adapted to play like a MMO : first, normally, you're with friends around a P&P table, so no real need for a competitive system, uh ?
)