Why does CoD: World at War have to be so fake?

So, I was talking to some of my friends about my new M1911A1 .45 Semi-Auto, and, when I said the thing kicked like a mule, he just laughed at me. After much questioning, I found out he thought this because of CoD: World at War. After I played the game, while it was fun, I was appalled to see that the .45 was the weakest pistol in the game (you could shoot the thing like an automatic weapon, which you could never, ever do in real life unless you wanted it to fly out of your hands), while the .357 was the strongest (the two have pretty much the same power though I think the M1911 kicks a lot harder). So, my question, why did they make the game so inauthentic? Any suggestions? Or am I just an idiot?