User blog comment:PerseusJackson/THOR/@comment-3127363-20101221231511

Thor has a lot of power but he doesn't know how to use it to the max, meanwhile Cap has little power but he can optimize it.

Cap stands a better chance of defeating somebody with equal or ore strength than himself, while Thor is maybe more on the clumsy side and is likely to be defeated by someone as strong as him or maybe even weaker. That's why Cap is a master combatant and Thor isn't.