My friend and I made sepperate accounts as fun accounts for COD. We riot shield all the time and play infected constantly, being the infected is just so damn fun most of the time! The only issue is all the god damn lag makes riot shielding sooooo much harder, there are so many times where I lunge at a guy head on and he doesn't get behind me, but somehow his knife hits my guy and my shield goes straight through him.... When panic knives beat shields there is something WRONG!
Also, it's impossible to tell most times if you actually have the shield pointed towards your opponents, I get shot in the sides and back constantly from lag, and to be honest, probably die more from being knived than anything. It's so broken. But if you get a good conection match, it's tons of fun, I've landed a bunch of multi kills with shield+tknife, I've even gone positive in TDM and kill confirmed using nothing but those two and moving around the map by my self or with teammates.
