I always find it amusing when some people state their opinions as facts. Instead of "I like/don't like" something, or "I want/don't want" something, often it's "this is wrong" or "unacceptable".
XCOM:EU was quite good but the cover mechanics were just broken.
If a game is working as designed it cannot be "broken".
You may not like some parts of the game as they chose it to operate it, but that's a different topic.
Personally, I like how XCOM:EU works, just as it is.

There is only one BIG goal in game development: the game should be fun.
Yes, but according to whom? It's difficult to make any design fun for everyone, so perhaps the best choice is as the developer wants to tell the story and play the game, with some tempering based on input from others.
From what little I have seen demonstrated of D:OS so far, I like much of what the game seems to be about.
I am certain I won't like every detail, but then again, it's not my game and story, so I want to see how they want to play it, instead of trying to bend the game just to my liking.