5-3-2 is the best formation if the 2 defenders on the side are good enough to know when to cover for your wingbacks and when to stay at the center, if not the wingbacks have to run themselves to death and they look like bad defenders and even worse attackers simply because they are too tired to do the right thing.

It is not the formation that decide wether you are an attacking team it is how far up the field you dare to play.