There is probably an official feedback thread coming soon, but since I played it now and will have to retire soonish, I thought I give my first thoughts in the hope I haven't missed anything major (actually, I do hope I missed something):
As much as I liked Pahvo Dissension, as much am I underwhelmed by PoP. It offers less gameplay than Mirror Invasion but takes longer. Yes, it is easier to do, which may be a saving grace, but basically you just circle around the satellites and shoot at anything that moves, interrupted by a couple of generously timegated interacts. Also, while the last part offers the bonus of additional marks for kills, there seems to be nothing to shorten the queue. And it doesn't have a mini arc, so you don't even get a proper boss fight in the end, it's just "mirror forces appear, timer runs out, mirror forces disappear".
If I haven't overlooked a major plot twist or mechanic, I'll predict a lot of AFKing on this one, but I still have the hope that I did overlook something.
My mother was an epohh and my father smelled of tulaberries