The original is always the best.
Gameplay is similar to the x-com games, but with many concepts stripped down or eliminated entirely. Graphics are appealing, sound is... adequate, there are many cool details like real world weapons, RPG-esque charachter development and UFO interception videos. Research tree is also well structured and the overall presentation of the game is likeable.
HOWEVER...
Why did they have to implement real time combat? It uses a pause system to give orders, but you'll end up pausing every five seconds because of new events and severe control issues, it takes all the fun away from the combat, it was much better by turns. And the game's difficulty is absurd, sometimes you'll win missions only because of screw ups by the AI.
This game introduces a few enhancements to the X-com games, but perfection would be somewhere in the middle, not on this game.