I think lead pipe is the most dangerous weapon and if used well, you can be invinsible. Combine with execution god-mode when you are unable to be hit by the enemies, you can regain your health like 1.5 bar each execution.
Aslo, execution act as a trap, because when the enemies come closer to shoot you, they usually stand close together and form a group, become easy kill for the lead pipe. I quad-kill countless time with the lead pipe by this trick.
The only thing that are dangerous about this is the enemies with mine launcher, they should not be close because they can shoot right after you finish your execution and deal a large amount of damage to you.Try to finish them with gun first or execute them first.