I not usually a fan of turn-based, but this one is so well done I may have to change my views.
Top notch graphics and sound. Voice acting is good. Interesting tactical scenarios.
Neat method of generating your personal character. You can actually design your character's face. Pretty cool.
The game only becomes turn based when an enemy sights you, so parts move along quickly.
Some of the things I really love about this game is the attention to minute detail, the open ended approach to each mission and the controllable and zoomable camera.