In our group where I would say that 2 of the hero players were very competent and the 3rd getting really good towards the end (I was not one of them
) and the same goes for the Imperial Player (playing very well from the beginning) and we won the last 5-6 missions. Some were quite close though. The first 5 missions were all very close with the Imperial player taking 4 I believe.
It felt like it snowballed with all the skills and we managed to get a lot XP which made a huge difference.
We FELT like the Imperial player suffered more from mistakes than the heroes.