You have to admit though that one would have expected far better things from a guy who's had the results (and even more, the showings) he had at 18-19 years.
There must have been something wrong with this guy, either in term of work ethic either in term of mental toughness and/or motivation.
Well, yes, hard to say you didn't expect more from him, but at the same time, he was after all just a teenager, plenty of teens get these great wins here and there because they have nothing to lose. Then when they actually become a name, people expect something from them and then the mental challenge is evident. Personally, I didn't think much of his success since they were merely at Monte Carlo/Hamburg and even then, Hamburg was an utter joke of a draw for him. Had he taken a big scalp at Roland Garros, or at least some slam event, then I think the hype could be much more logical. Though he did make the second week of Wimbledon and US Open, the only big name he took out was Ljubicic.
I think he is a bit lazy in terms of his ethic and probably just as stubborn because any coach should be heavily working on his serve and forehand, which again, didn't improve much at all IMO. It is like he thinks he could win events merely with his backhand.