Just finished 2.5 on normal. It felt pretty good and totally bug-free, except for alt-tabbing after a couple of minutes of AFK, which is annoying.
But the ending felt very anticlimactic. Victory by completing a research project and then clicking two times? Yaaaaaaaaaaaaaay.
Why not launch not the payload from the orbital cannon, but a capsule with elite PHALANX operatives? Say Carrier UFO has great anti-missile defense, but a nimble 12-person dropship could say drive itself right into the bridge. Would make it feel more like original X-COM or the following remake last battle, which would be nice. All it would require is a bit of writing and one map design.
What say you, gentlemen?