In your opinion who is the most brutal hero or villain in Marvel?
Sabertooth has done some seriously vicious things over the years but it's hard to say because all of the top level darker villains are like that. Dark Beast experimenting on living mutants and Doom doing the same to asguards. All of that is pretty brutal. For heroes it's Ares,Punisher,Deadpool,Deathlock,War-Machine.Wolverine,Sentry