Lack of game? Have you ever seen him play? He plays aggressively, can hit topspin and slice, volleys well (unlike 90% of the rest of the top 100), and is tactically astute.
So let's bag him out because he doesn't hide his weaknesses behind a big serve and a forehand.
He's tactically astute, I'll give you that, and he can volley. But "plays aggressively" isn't really true and he doesn't really have a weapon. He's more like an aggressive counter-puncher than an actual aggressive offensive player. Nothing in his game grades out as anything but adequate, and his volleys are good, but not even that great. So yes, his lack of game is what makes me not like him. He's one of the least interesting players on tour.