What are the specific complaints regarding the pacing? Too fast? Too slow? I didn’t have an issue with it either time I saw it, nor did any of the top Hollywood editors I’m friends with. And I’m friends with most of them, although obviously I can’t name any of them.
I felt that it was way too fast-paced with no time to breathe during much of it, especially the beginning. Certain parts were OK (the section of the movie set at Maz’ castle wasn’t too bad), but overall, it felt like a rollercoaster ride with no time to enjoy the scenery.
But maybe I’m just old. ;P
Also, the destruction of Starkiller base seemed anticlimactic thanks to the way the third act was edited–though I didn’t immediately realize that the planet was crumbling due to the destruction of the oscillator (like we saw near the end of the lightsaber fight), or whatever happened, so the buildup is probably better than my impression of it was.