The penalty mode needs to be improved. Goalkeepers in reality never save a penalty which is bound for the top corner so it's a bit of a farce to have it in a game. Players should have the ability to place the ball in the top corner without the keeper even having the slightest chance of saving it. However, to make it fairer, I think the AI could be improved. Based on the way the game is going, players who are not playing as well as they could (based on his current game stats) could (should, would) actually find it difficult to convert a penalty, if he's playing reasonably well then he should have a decent chance of scoring and if a player is playing exceptionally well then his accuracy should be greater (all that providing the player shoots in the right direction of course). You get the idea, no?
Furthermore, if the goalie has made some blinding saves then up to the point of the penalty the probability of him saving a penalty should be greater, and again that's providing he dives in the right direction of course.