The Gunners enjoyed an emphatic victory against Blackburn, scoring seven goals in their biggest win of the season. They have been inconsistent this year and have dropped many points, which is why they are currently in sixth place.
However, they are only three points behind fourth-place Chelsea. Arsenal's defense has had some very consistent players like Laurent Koscielny but on the whole, they do not look solid, letting in many goals this season.
Arsene Wenger signed defenders Per Mertesacker and Andre Santos this summer, just before the close of the transfer window. Santos has been injured for some time now after having an inconsistent start to his Arsenal career, while Mertesacker needs to further come to terms with the pace and physicality of the league. The good thing is that there have been encouraging signs from the German and he has looked more assured in recent weeks.
However, Sebastien Squillaci has looked out of depth for Arsenal in the Premiership and could be offloaded in the summer while Johan Djourou has also been very inconsistent. With Kieran Gibbs also injury prone, the Gunners' manager could target another defender in the summer.