He was pretty good against Barcelona that season. Certainly better than Diaby and Song who lost their careers against the very same opposition.
Diaby and Song were every Arsenal's fans wet dream at that particular moment in time, I know many will deny it now, but here's something interesting.
On the 27th of March 2010, we were 4 points off Man Utd who were 1st after 32 games played. At the time, we had a lot of success with Diaby and Song (occasionally Denilson) sitting behind Fabregas. As proven by the table standing. We were even top of the table the week before.
On the 31st of March 2010, Barcelona's midgets destroyed Diaby and Song, and I don't think either ever recovered from that, and neither did the fans in their opinion of the two.