Indeed, I had FIVE hits on a guy 10 metres away with the DAO-12 and he didn´t die. Ever since I really want to play with shotguns, but going against people with AR and carbines is suicide, same with most PDWs. In the tight corridors or small rooms there´s explosive spam and you or your enemy are most likely dead frome something going kaboom before you´re in shotgun range.
I thought that maybe with the Rex or the M93R as a sidearm you´d be able to win close and medium rabge encounters and use the shottie for ultra-close combat. but I haven´t played after unlocking those pistols. Damn, grinding co-op is retarded, but somehow fun. Great way to practice headshots, too, I guess, I´m always too nervous to aim for the head, but here you won´t die and can see how you have to line them up/use the recoil for them.