Still fun all these years later!
Jeez, where to start?! This game was an amazing breakthrough in turn based strategy games. The campaign aspect is long and complex, you need to worry about politics, research, base-expansion (and defence), and soldier training. The missions are edge-of-your-seat suspenceful, and at just that right difficulty. The missions vary from your basic clean up missions to the more complex terror missions. The aliens are creatively done, they have a wide arsonal of weapons for you to discover and research, and the psychic battles are just as important as the physical ones. Music is moody and well composed and the sound effects are superb.
There wasn't really anything I didn't like about this game!
The Bottom Line
The greatest turn-based squad-based strategy of all time.