@Riot Only 1 difference between Juggernauts that do well and Juggernauts that don't
The Champions I count as Juggernauts (even tho only about 5 of them are specifically defined as such by Riot) I do because they fit the definitions and have the same exact qualities in most cases as the defined Juggernauts.
The Definition of Juggernaut:
When you think brute force, these champions should come to mind: powerful, durable, immobile and melee. They’re League’s hulking titans who, come late game, turn into super tanky carries who’ll pretty much destroy anyone foolish enough to get in their way. The prototypical juggernaut is Nasus, the classic one dog late game wrecking machine. The archetypal raid boss can only do his thing when he’s in melee range, and his lack of gap closer means he often has to rely on allied speed boosts like Sivir’s On The Hunt or well-aimed crowd control like a Morgana binding to get close, but once he does, he unleashes the power of his trademark Siphoning Strike.
Works/Does Well:

Doesn't Work/Doesn't Do Well:

Has reliable CC:

Doesn't have reliable CC:

Mordekaiser's game health and viability would be far better if he didn't have to waste 3000g just getting a minor CC and Illaoi would have a much easier time being relevant if her Ultimate had a huge but very short duration slow