I was pretty set on Gladiator myself till they broke it this patch. Now I've been tanking as Marauder. I'm going to give tanking Ifrit a whirl as a Pugilist once I get the knuckle drop from him and get a gear set for it just for giggles.

Really, until 1.20 or even 1.21 with jobs, it's just play whatever is strongest for the content at the time. Hopefully they can make fights to where a certain class doesn't have an overwhelming advantage than the others going forward. I think it's pretty silly to stack fights with 4-5 of the same class to efficiently win the fight.