One thing that made me re-load saves at least 3-4 times, the first time I played through, was Attacks of Opportunity (I know exactly how they work) the interface to tell you when you are going to incur one is not obvious, especially when your screen is looking at an enemy far away, it took awhile to notice the HUD telling me that I was moving to attack.
Fix: A popup that tells you when you are going to incur and Attacks of Opportunity, with an option to turn it off for veterans.
