How high is the damage reduction from gunzerking with the skill come at me bro?

Bottom line? Not enough. I do not have the exact % in front of me at the moment but I will look tomorrow and edit this to include any reliable info i find online. I wasted a lot of time and points in the red tree on my gunzerker and in the end he was still getting mowed down by lv 37 bandits (not badasses or armored either, just regular bandits) when he was 45 and had some very impressive gear, both legendary and just rare purples and such. I found him to be far better at just pouring out lead with the blue tree and using a group to stay alive.