I think it should read like this :
Eurogamer: When you look back on other games released since GT4 - Forza Motorsports among others - Do you look for things (in other's work) that you want to implement in the GT series ? Caracterstics that'd push the genre forward ? Or do you developp GT in a sort of void were you try to ignore what the competition is doing?
Kazunori Yamauchi: The latter is what we do. We don't disect other games while developping Gran Turismo - we only focus on what we want to achieve with the game. Actually, it's quite difficult for me to play other games for more than five minutes at a time. The low quality of the playability really shows in them and I have a hard time disregarding it.
By "low quality" he's probably talking about unrealistic car behaviour in games rather than esthetic or pure gameplay.
Essay Pro