Setting aside Roddenberry's idea that the citizens of the Federation and Starfleet Officiers were completely without fault. I think it'll be one of those situations where the deeds of the character get exagerated over time. Case in point, consider how many Americans perceive the near-mythic personalities of the 'Founding Fathers' vs. the personalities of even the civil war.
There's definately a level of hero-worship on the part of later generations. Nostalgia seems to increase the further in history the historical figure is.
Taking the canon at face value, I imagine that the feats of Archer will be almost god-like and Kirk's mythic by the time of the 26th century.