If anyone here liked the mission sections of X-Com (or if anyone goes as far back as Laser Squad or even Rebelstar) then I humbly recommend Stellar Forces (http://www.stellarforces.com/) to them. It's a squad-level turn-based strategy game where you play against other human players across the internet. Screenshots and videos can be seen on the website for those interested.

Cheers,

Steve
http://www.stellarforces.com/