Got it yesterday.
I am
very positively surprised. The game has a lot of depth concerning researching, developing and improving stuff, it plays well, and it is
CHALLENGING both in missions and the "geoscape" mode. It was dumbed down/streamlined in some aspects I'd like to keep from the original, but generally the changes have been for the better.
One thing I kind of don't like though is that I have no say in
assigning classes to soldiers. I understand that if I could do it all on my own it would make the game easier, but now I am seriously lacking "assault" and "support" troopers, while having too many snipers and heavies. I guess the classes are assigned based on what you do with the rookie on his/her first mission, so my style of play leads to this, but I still don't like it.
Other things on my mind:
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money is a problem! I am surprised, I have never had a problem with my finances in previous X-COM games, I was usually awash with money. Here I am permanently struggling to scratch up money for building weapons and armours for my troops.
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resources - alien alloys are permanently in short supply. And no "I have tons of alien weapons from missions" any more - unless you are willing to risk getting them alive, which gets pretty hard pretty soon.
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Air combat is a bit of a disappointment, shooting UFO's is pretty rare, and even the "interception screen" is too simplistic. I haven't yet developed advanced X-COM crafts.
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Soldiers' stats: rookies are all the same? Ahh, I kind of liked sifting through rookies in the original game.
I'll add more things as I remember them

So far so good, I must say.