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Just watched most of the video. EVERYTHING is the same. The animations, the sounds, the weapons, the way enemies behave. Hell, even the darn weapon pickup icons and text are reused. If it was coming from another game you could say "If it ain't broke don't fix it." but it's coming from COD, so it's clearly a "Let's get away with doing as little work as possible and tards will still buy it".
This isn't MW3, it's MW2.1
But this formula, of copy/paste has worked several times now. Admitedly, this game could be the turning point, especially with BF3. But if you go off past experience, doing anything different they would get slated for messing with a winning formula.
You can not please everyone.