Bar Mitch, I don't think I ever heard any Arsenal fan say Diaby was poor.
Maybe they got frustrated the last few years of his career here when he was injured all the time, but I am pretty sure most knew he would have been a starter here if not for that bellend Smith at Sunderland.
I am pretty sure like 99% of Arsenal fans knew Abou was a top player.
Diaby is poor, a lot of people forget that he sucks so much at one point that he made Denison look good in comparison. This is the main reason why Wenger cling onto Denilson for so long, because it is kind of hard to argue Diaby is the better player. People forget that Diaby sucks because
1) He has little football IQ and keeps making bad decisions
2) He holds onto the ball for too long
3) He sucks defensively
4) For a guy of his size he is surprisingly easy to be out muscled