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You could accuse him of many things; politically - niaive, egotistical, bombastic, racist, etc etc but 'overrated' is just plain wrong - to control such a force and achieve, precisely, his D+90 phase lines shows just how good a general he was.
Monty redeemed himself in Marketgarden however....
Was the Monty slur really unwarranted? I mean, did the common US soldier at that time have that idea of Monty or later? Its just possible a few GIs were of that opinion regardless of the facts. Same as the Mustangs at the end. Could've been Typhoons but didn't most GIs just assume that anything in the air was a P-51.
Including such lines does become necessary if you want to create a character. Otherwise we get something akin to "THX 1138".Many soldiers hold opinions, just because they do doesn't warrant their inclusion