Obviously, he underperformed as a whole during the stint here, there's no denying that. "Pretty good" was more of an understatement really.
I would say getting 16 goals and 11 assists from midfield, and getting into the Team of Year (in a bad team, by the way) was about the level we would have hoped for, when we bought him. Of course, he should have performed to this level across all seasons, but that didn't happen.
I was basically just refuting that there isn't a single season, where he performed well enough to live up to expectations.