It could equally be argued that Arsenal depend too much on corners. Last weekend, when down to 10 men, Chelsea left 3 forwards up by the halfway line when the Arses had a corner. The Arses had to keep 4 players back and the Chelsea goalie caught the ball unimpeded.
Someone has explained this to me before and I recall it making sense, but I still don't understand why teams don't just do this as standard. Leave your two nippiest players in the centre circle, and any sort of decent clearance or goalkeeper claiming the ball and you're away, unless the opponent sacrifice players who they'd want to otherwise be attacking the corner.
At the very least, it's going to mess up whatever clever, pre-prepared corner routine they had in mind.