Not understanding Call of Duty to such a degree should be embarrassing for people who make "those kind of statements", but for whatever reason it isn't.
My only advice is to have been born sometime near the late 80s, maybe even early 90s. Have a dad who is into war movies (Audie Murphy To Hell and Back, Gettysburg, The Blue and the Grey, Gods and Generals, surely many more that I can't think of off the top of my head like these ones)
The biggest difference between these movies is whether they're in black and white or color.
War never changes -- but times change, and technologies change. If you are expecting "Call of Duty Unicorn Safari" then you can keep hoping, but it's never going to happen.