It's clear as the sun, it needs boots for the MS, Health for the Shield, CDR for its long cooldowns, another item for addictional MS, eventually lethality to do decent damage, Sterakks to survive... It's too much item dependant and most items active/passive abilities are a "must take" to make it work smoothly, when for example many characters are good on their own and only made better by stats scaling and said items active/passives.
Most platinum+ players have enough experience to totally predict and take advantage of the long delay from Urgot's Ult, which results really often into a wasted opportunity to win the lane or do your job.
I'm totally in favor of counterplay, but this is ridicle.
Also in teamfights, the Delay makes it really hard to land it properly on the target, when people are costantly moving and other 4 meat shields can simply step in the trajectory or dodge away.
That's why I suggested to bring back the old Acid Hunter mechanic, if you successfully lock on a target in a teamfight, you should be still able to lock it with your skills like the old Urgot did.
Didn't mention QSS, dispels or Immunity to CC (Gangplank, Kled, Morgana, Olaf, Sion, Alistar, Kled), Invulnerabilities (Tryndamere, Kayle, Zilean, Guardian Angel), Untargetable phase (Master Yi, Kalista, Kled), Heals, Shields on a 26% Hp target, not having the clearest idea of what 25% hp are on the enemy bar (Lulu also), Shields Mechanics blocking it (Braum, Yasuo), Clones blocking it (Wukong, Shaco)...
There's so much active and passive counterplay that makes it an hell to land and a so much circumstancial spell.
Since the biggest utility Urgot brings is this Ranged Execute, being not able to pull it out makes Urgot a less efficent choice.
I could as well pick a Zed or a random assassin/fighter and do the job with a click-target ability.
I've played it more than 50 games both ranked at Gold/Plat level and normals. My mechanics aren't perfect, I'm not a proplayer, but I think I've enough experience with Urgot's kit to understand its pro and cons with no problems.