9/10
I’ve completed every game in the X-Com series and I can say quite clearly that Apocalypse is the best game in the series. X-Com is by far the best strategy game.
Firstly, the game features a three-pronged gameplay system. One is turn-based, another is real-time, and the third involves vehicle combat on an open map outside of engagements. Turn-based and real-time battles are fought on foot only. In open-world battles, however, you need to use aeroplanes, cars, motorbikes or trucks.
The details of what you can do on the game’s open world map are my favourite aspect. Firstly, you can attack every single building on the map. You can demolish every building. Almost every building belongs to a faction. The actions you take on the map (clearing out buildings overrun by aliens, rescuing people from buildings under alien attack, killing opponents, looting items, etc.) determine your relationship with the factions. Your relationship with the factions, in turn, affects the entire game. For example, you can barely manage to win over factions that worship the aliens. They can give you alien items.
I recommend you play the game to discover many more details like these.