I thought the movie was excellent despite agreeing with your assessment of the plausibility of the final battle. However, I was able to suspend disbelief and go with it.
IMHO it was not as bad as most action movies, like Mission Impossible where Tom Cruise leaps off a speeding train and violently collides with a helicopter without any apparent injury. Or any Jason Bourne film where the protagonist can effortlessly take out a legion of armed, trained combatants with his bare hands.
I think Fury is as close to an old school WWII film where our side are the good guys as has been made since the Longest Day.
http://www.homeofheroes.com/moh/citations_1940_wwii/day_james.html