Well, if you were to just look at the negatives of XCOM then you might give it a bad score. (which is why despite my criticisms of XCOM in this thread I pointed out that I was playing and enjoying it, there's just stuff about it I wish had been done a bit differently).
It's all about the differences in design decisions, and you either accept them and enjoy the game, or reject them and don't play the game.
In other news, I got my soldier portrait the other day, which I uploaded to imgur:
http://i.imgur.com/F9Jqs.png
I'm glad Xenonauts is still months away, it means that when I'm bored of XCOM I'll have something new to play! (in fact, thanks to my kickstarting, I probably wont be buying new games for quite a while).