To answer your question, it's hard to pinpoint a game where he has been fantastic against a top side. However, he's consistent!
I found it really interesting when you said ' So far he looks to me as a player who’s consistent against average teams but nothing remarkable when the going gets tough'. How many of those players have we got? Players that will consistently turn up against your Brentfords, Fulhams, Lutons, etc? The answer is, not many, and that's one of the reasons we are where we are.
Fixed