For starters, they should have dropped the overobvious upperclass Brit accent.
If you have read the book, then you'd know that the partycommissioner who wrote the articles about Vassili Zaitsev, was far from being a friend like the movie showed us. Zaitsev prefered to operate alone, or together with a fellow sniper, and certainly not in the presence of someone who would only walk in the way, possibly even give away his position.
Major Konig's name was originally Heinz Thorvald, pulled straight from the academy where he was a teacher. He was indeed Germany's best sniper, but had no combatexperience whatsoever. The only experience he had was getting drunk at German high society parties. He didnt have the looks of a soldier either, he was fat, had a face full of freckles, and manicured hands like a female. That's not exactly how they made him look in the movie, did they ?
Then the most annoying thing: Vassili Zaitsev himself. He was a hunter, straight from the Siberian steppes, Mongol appearance and everything. Nothing like the candy ass looking guy they picked for that part.
All together it was nothing like the original story, that's why i was VERY dissapointed with the movie.