Note: most of this is based on what I can remember.
I remember that a year ago, I was playing around with some savegame editor for Apocalypse. I tried to edit relations with the buisnesses, and I noticed something funny.
1)I can modify relationships for not just X-COM. Instead of X-COM and Transtellar(Alien Sympathizing scum), I could make it Transtellar and the Aliens.
2) (Right in the middle of a new game I just started)It seems every single faction is neutral to the aliens. You'd think that with aliens trying to invade Mega-Primus, their relations should be hostile.
That was the last time I played Apocalypse, because I found it too boring compared to the original. I tried to enjoy it, but I just couldn't. Realtime combat? Cityscape combat? Vehicles instantly dying if the road under them is destroyed? The god-awful slow timers on the Cityscape? (Don't even bother setting it to Ultra, because by the time you can react its already too late.)? The micromanaging, even during the air combat (Hoverbike Swarm + Forgetting to issue commands due to the intensity of combat= RIP hoverbikes)? Bugs? Brainsuckers? Not worth it. I can compliment the game on the Atom Punk/50's style, though. And the concept of the game itself.
Apocalypse is a massive example of "What could have been", according to one interview with Julian Gollop or something. I remember that he mentioned the game being bigger and more complex, with things like guns that shoot tracking devices, jail cells, and more. I'm honestly wishing for 2K/Firaxis to do another Enemy Unknown, except make it a remake of Apocalypse.
Basically, I can love the concept of Apocalypse with the realtime combat and various different factions(Faction X hates Faction Y! Faction X occasionally attacks Faction Y! The enemy of my enemy is my friend! X-COM, Thank you for helping me!), but the execution doesn't suit my tastes.