One thing I remembered is that while Dragonball is generally pretty mindless, you can see that people like Goku and Vegeta actually have strategy, like waiting for Golden Frieza to run out of power because they can tell that it's using up too much energy. Sure, some of that is still outside info but it's not exactly a stretch to say guys who are used to dealing with transforming would know if an opponent is using too much energy than what's sustainable. That's actually fighting with brains and some tactics, not "E=MC^2, you're dead" which is what a lot of people apparently think using your brain in combat means. In Azumanga Daioh, Osaka was talking about how what if Chiyo goes to USA and gets kidnapped, she should then use her super genius brain like they do in movies to fight back, and then get shot and die, and I think that's actually what should happen to most of the 'E=MC^2' fighting guys in their world.