I don't know if Guardian is a better tank than a Paladin, but it's definitely a better brute-force damage-sponge than one (or 'classic tank', as [ProfessorOwl_PhD [any]](https://wanderingadventure.party/user/professorowl_phd%40hexbear.net) said). Since tanking is really about managing party damage, not just taking it, there are a fairly wide variety of potential tank builds in the game.
Guardian is just the WoW Warrior version of that, right down to the taunt function.