It resembles a tiny white block when using the aerial fielding view and can be tough to properly get in front of. I absolutely despise the fly ball mechanism. You have to get under a shrinking shadow and accompanying target to make the catch, yet neither shows up until the ball is already well on its way. Valuable seconds are lost while you wait to see where they will appear. This often causes me to miss easy flies.
Foul balls are perhaps the biggest nuisance in the game.
There are a lot of them. Every at-bat tends to feature a couple. This wouldn't be so bad if the engine didn't follow balls hit out of play. The camera will track a foul hit on the ground or into the stands for a good three seconds, a pause that gets very annoying, very fast. There seems to be no way to skip past this.