Match Engine: One on ones really need looking at. Players hardly, if ever, score from them. Two on ones, when a player would generally pass for his team mate to shoot, it doesn't happen. The players with the ball would shoot himself and it is saved. Similarly, when a player has a chance of a decent shot, he doesn't always take it, when IRL he would.
As above is the way I get a player off. I think I did it once (when all 3 subs had been used) but forget how.