Well they did fuck up the SP, but MP is good because they borrowed the basic format from COD4. Good choice on their part.
As far as the re-enacting historic events...well...
my father was bomber pilot in WWII so I grew up with hearing about that era.
When I was 12-13 my friends and I used to dress up in fatigues and run around the woods playing "army" with BBguns (one pump rules, no headshots).
I was a history major in college, spent time traveling around Europe seeing sites of major and minor battles as well as museums, concentration camps, etc...so clearly I was and still am interested in the real history and the games are an interesting, if unrealistic, extension of that.
That said I know that creepiness you feel.
I've not been a big fan of the games that focus on post-WWII like "Battlefield: Vietnam". Not sure why, because all war is outrageous, but that was one step over the line for me.
COD4 didn't bother me at all, but America's Army does...maybe because it's overtly propagandist and my tax dollars are paying for it?
I guess I'm just weird. What else is new?