Before the wank hits I'll speak the truth
Null can deflect bullets and do little anything else, he has little fighting skill in comparison to Cap. He lost to Big Boss, a guy who has no peak human abilities who in turn got trashed by Volgin, a guy who can't damage concrete with his bare hands and also has no fighting skill.
In short Cap would steamroll all 3 of them but the majority of this site doesn't actually read comics and talks out of their asses. In a way I'm glad I'm not active here anymore because I would catch some of the contagious stupidity that is free flowing in this cesspit.