Because it's set in the Xcom universe has the alien invasion storyline & command elements which are intrinsic to success in the missions, I know what you are saying but this game is not exactly hiding that its a third-person shooter with tactical elements, loved Xcom Enemy Unknown & the original but I really don't have a problem with this game seems solid enough from what I've seen.So why put XCom in the name then?
Sure there's nothing wrong in making any kind of game you want. But why take a name for a game that's traditionally one thing, and use it for something compeletely different?