It does have more firepower. But he wuld've been surrnounded and when he starts shooting someone wuld shoot him and he wuld die.
I'm afraid you are missing something here. It's not Fallout in single player, and you are not The Chosen One, immortal and invulnerable killing machine, blessed palladin on his holy mission.
"LOLZ NERF IT BCOZ I DIE!! NERF IT SO I WON'T DIE!!!!!111oneone"Learn how to make proper builds, if you all guys had 40-80 hp and he was tanked with 250 and 2x toughness then no shit you all died. Save the bullshit realism arguments for yourself as this isn't Operation Flashpoint. Also 7 guys being better than 1 isn't roleplaying.
Plus I think the only way to actually play the game is making a BGer and getting a minigun