Sorry, Arsenal is full with mediocrity. No winning mentality owning by them, and saying they could win the trophy easily after they won against Madrid is so dumb. I know they tried to create mindgame against other teams, but it's just becoming a boomerang for themselves.
Things worsen when they can also become the only crypto among top 5 in PL who being trophyless. There's nothing change from them even since Arteta came as a new manager.
It has been 5 years since he being appointed, and no serious achievement so far. I think he's worthy enough to be sacked. They have no reason to defend him when they spent almost 800 million, but their last trophy was 5 years ago.