He's not implemented perfectly, definitely some issues with him being tedious more than dangerous but I can't imagine the rpd as is being more interesting without him, the B run definitely would feel pointless. the truth about zombies in 2make is that they're only a threat when they're supporting a higher tier enemy or when you're constrained by the environment to a point where you don't have an easy escape route. the layout of the building as is there's too much dead air when you can just stop and focus fire a zombie down or play chicken waiting for a perfect opportunity to juke them, mr. x is able to round out that dead space and keep on your heels. completely absent of him the game might be more comfy but a lot more of it would be pointless.