So I picked up Xcom: Enemy Unknown during the Weekend Sale on Steam.
The game is good, but I can see already the game might get a little repetitive after some time, it's not like the games you can play marathon, well at least, I can't. Because after some missions, you feel you have done the same, just different maps, but then again it's pretty enjoyable to get better and different results, as you will improve your tactics.
And one thing, if you get Xcom: Enemy Unknown , go to options and put on Auto-Save, its not on by default, I learned this the hard way.