Its true, people aren't pissed off at the concept of the game, its the fact its trying to say "look at me, I'm just like the original" even though it BLATANTLY isn't.
Another example for me was the doom movie. If you had just released a movied called..."Mars" or whatever with the same script it would have been much better, because I wouldn't have had false expectations. Alien mutants? what happened to hell invading? Same thing with this. You can CALL it XCOM all you want, but it ain't XCOM.
To all you that haven't played it yet, go on to steam and grab the complete pack. Skip enforcer, interceptor is probably easiest, then apoc, then ufo, then terror. The UFO:A* series was quite good, just missing something from the originals. As for being a link, didn't cenega manage to get some of the original microprose team working on it?