I've always liked the way he played Rach's 2nd piano concerto. Funny thing is, the Lang Lang bashing on classical piano boards is comparable to the Kennedy/Feinstein/Hillary Clinton/DU bashing on conservative gun boards. You mentioned "brilliant" and "depth of emotion;" that's what mnost of the bashing centers around. Everyone agrees that he's got wonderful technique, but when it comes to musicality the popular consensus is that he's all show-off and flash, no real emotion.
Needless to say, I stay out of those bashes. Saying that you like something he did (like I like the way he plays Rach's 2nd piano concerto) sets you up for a rather severe verbal beating.
Wow, that's a bit of a rant. Had to get it off my chest here; can't do it on those piano boards.