you cant let a bad experience such as this influence your view on him. the piano was probably at fault, not him. ive heard him play the busoni concerto live before and he did a much better job than in his commercially released recording. the bass was solidly controlled and it didnt sound like a cacophony. also, when i saw him on saturday, i was sitting toward the back of the hall, yet i could hear almost every note that he played. his tone was very crisp and not cacophonous at all. and hamelin's genius may be in quickly learning material, but that is not where it stops. he does know how to take charge with an orchestra, as i have seen when i have attended his concerto performances. i was able to hear everything just fine. in terms of his musicality and expression, he, contrary to some opinions, does show feeling and passion when he plays, both in his actions and in the music. he is no lang lang (THANK GOD) but he does show expression in his body language where needed, but in a conservative fashion, which is how it should be, in my opinion. if you want further proof of this, listen to him play standard repertoire. as was mentioned in another thread, this is the best way to compare him to the other "greats".
EDIT: i think we should draw the line here. any further argument would be pointless, for as was said, this question at hand is VERY subjective. everyone will have a different opinion.
<rant over>