I think I'm in the minority here but I really liked the exo mechanic in AW, at first it was hard to learn but once you get the hang of it, it was very smooth and made trekking half the map somewhat fun.
I like Black Ops 3 right now (still not in the same comparison as Black Ops 1 or 2) but I am not a big fan of the Wall Running, as it is used more as a positioning tool than actual firefight advantage.
Even with the implementation, more people are opting for the camping route and slaying than actually wall running (which I find pretty sad) but we'll see it's been only out for about a week.
Also, that huge nerf to suppressors is complete garbage.