The problem with those movies is that the bad guys are letting the protagonist hit them, he doesn't have to worry about getting hit back. This is why you never see MA's just run out and start throwing wild punches at each other, like you see in most street fights. Because with every kick/punch you throw at someone, you're setting yourself up to get kicked/punched HARD! or taken down. And you're at a big advantage if you're fighting on top.

Watch a Fedor Emelianenko or Mirko CroCop (this guy's knocked out so many people with kicks to the face, he's fucking insane) highlight on youtube or google video if you want to see some real standing fighters.