I got Mudslinger the other day along with Double clutch, he was definitely the one I was expecting the most from and I wasn't disappointed.

In robot mode Mudslinger is well articulated like the other PCC commanders however the balls for his elbow joints are positioned slightly on the inside of the arm so the arms can't be straight i.e. they curve inwards slightly and while I understand this is for his other modes, it was the only thing that disappointed me a little.

In combined mode he is awesome.
I would say he is the second widest (next to Smolder) however hes is definitely the most articulated (at least in the arms). He has the regular PCC combined articulation plus (due to his transformation) he can raise/lower his shoulders (like shrugging) and move them forwards and backwards.

Like Double Clutch, his drones are much better and more stable than the first wave of drones and like Double Clutch, one of my leg drones had trouble auto transforming (I think i just had a bit of bad luck that day ).