Agree with all of it except explosive damage being too high. Compared to old MV, it feels way lower. Blast radius also feels smaller? Might be just me, or maybe its just been too long, but thats how it felt to me. In old MV, it was easy to spam bazooka and kill everyone. Now, you gotta hit like 4 bazooka shots to kill a person, and I dont think thats too much dmg for explosives. I personally get spammed by riffles A LOT more but I dont think thats bad balance-wise.
To finish up I will just reinforce the point about the shotguns made by the original post. They are useless. I only ever feel any decent damage from my shotgun when I hit a perfect, super close range wave step with 2 shots right on their face, and even then they usually dont die right away.