How Effective is DEF?

[Takanomiya Hijiri]

4: Assuming these secondaries were low-level thugs with attacks no higher than 2, they could pierce skin but because of A, B and C one bullet was not very impactful.

I was actually surprised by how much damage you let them deal. I mean, you do have Regen and Survival, so it's not like it was ever going to kill you, but even so... if they had only 2 ATK then their guns would be significantly less effective than real life ones (even 3 ATK is only 'near' realistic)... and with 5 DEF real life guns should only be able to cut you if they land at least two shots in the same place, so for them it'd likely have to be 4 shots or so to get the same effect. See what I mean?
If you had wanted to write it this way, it probably wouldn't have been unrealistic for your character to just stand there without his shields and laugh at them as they all fired at once and barely even scratched him...