Jaggernauts according to Riot:
Fighters are durable and damage-focused melee champions that look to be in the thick of combat.
Juggernauts are melee titans who relentlessly march down the opposition and devastate those foolish enough to get within their grasp. They are the only subclass who excel at both dealing and taking significant amounts of damage, but in turn they have a tough time closing in on targets due to their low range and extremely limited mobility
So why Garen lose to Shen and Akali and Vladimir 1v1? Hopefully the Rework will make the champs run away from Garen and not the opposite