I thought of making a post along the lines of Urgot's important abilities. But I will post some thoughts here.
The one ability I believe should stay is his R, Hyper-Kinetic-Position-Reverser. Why?
Please go to where Urgot is on the battlecast link. Notice, he is listed as a SHOCK TROOPER.
http://na.leagueoflegends.com/en/skin-release/battlecast-skins
A shock trooper is one who mobilizes very quickly to penetrate the back lines on an enemy formation. Sometimes armour (tanks) would be used to support such an operation.
All it takes is 1 second for an Urgot to expose a weakness in an enemy formation and reek havoc on the backlines. This strategy can be very risky which is perfect for a champion who in former life gave very little thought of his own well being in battle. A true Noxian.
To be candid, Urgot's Q and E were the causation for nerfs and unfair gameplay. Too much range and damage for an ability combo that guarantees too much safety and results if it lands.
**I propose that that Urgot keep his ultimate and some kind of shield. **
Now, how is Urgot different than Sion (this will lead into other parts of his kit, I promise)?
Sion and Urgot are similar in that they were both physical and fearless warriors on the battlegrounds who wouldn't surrender even at the cost of their own life.
They differed starkly in reanimation, however. Sion was captured and cleanly executed while Urgot had suffered years of abuse and then a rather grotesque and sloppy cut that tore him in two.
We see what it took for Sion, some metal fittings, a furnace to enhance his potency, a missing leg sure, but most of him still intact. Thus he can wield his large man-sized axe and crush those like he did in days of old and glory (with some extra benefits).
Urgot on the other hand could not be brought back by necromancy alone. He needed some new body to be fashioned to house the spiteful and resilient spirit of Urgot. In comes Zaun.
And with Urgot being given a new body by Zaun, it only makes sense he would have new tools of destruction.
I feel he should have at least a long range ability and have an auto ranged attack, and the rapid firing of Q is interesting. To me it is far more badass and thematically fitting to think of Urgot as one who will charge in and cause pandemonium.
Furthermore, with a more unifying model, one that causes true discomfort and revulsion, this would be a champion that you would want to keep off your back lines, and he would look the part.
An undead shock trooper, cybernetically enhanced that causes the normal soldier to become weak-kneed praying to which ever gods they do "asking how such an unnameable perversion could be allowed to walk the soil". The wheezing pulp of rotund, carrion flesh, covered in his opponents blood; never stopping, never lamenting his actions, filled with singular purpose, that is, to be a war machine and never let death take that from him again.
His passive should be changed as well. It lacks interaction for both players and is invisible stats.
So his Passive and E, or it's functionality should change. No more damage reduction and lock on missiles.
His voice should be heavily filtered and his model should create a new definition of "unwholesomeness".
TL:DR
P "Zaun..." - Replace
Q "Acid Hunter" - Keep/Tweak (Get rid of the scythe, clashes with high tech theme)
W "Terror Capacitor" - Keep
E "Noxian..." -Replace/Tweak
R "Hyper..." - KEEP!!! (This is one of the most variable, risk/reward/, engaging (for both teams) ability in the game is the reason I love playing him so much).
"SUP, BITCHES?"
https://youtu.be/104tQfcK1sI?t=2m44s
or 
Who both are disruptive tanks, and both do their job from a reasonable range...
I don't think Urgots artillery identity would be an easy one to keep, but he might have an artillery slow that stuns after hitting it X amount of times?
and make another ranged bruiser with even more range.
.
If he won't then there are other tanks that are significantly better than him.
juggernauts
tanks
