It takes seriously good quality scripting to make you ignore the fact that your character, and their supporting cast, all appear to have been crudely hacked from balsa wood blocks. All the GTA games achieve such an impressive level of characterisation - especially so in the case of GTA III's mute lead - that we were fine with the spectacularly ugly faces and spade hands.
Even San Andreas suffered from characters that looked like wood puppets, with cylindrical arms and faces like photos pasted onto balloons. And still we didn't care - the game was that good. However, if we find street ladies in GTA IV that resemble these blocky babes, we won't be happy.