Judging by a lot of the reaction to Mikel Arteta’s comments in the immediate aftermath of Arsenal’s Champions League exit, you would think the manager of the second-best team in England is some sort of deluded buffoon. You would have at least thought he was an embarrassingly bad loser. Arteta is neither. In the sense that his team have won only five of their last 13 games in all competitions, have seen the Premier League title claimed by Liverpool and come up short in the Champions League, it