what class best fit Condit greatSword?
Mesmer can use it decently if you run a Sharpened Images condition build, since the GS clones hit multiple times and are thus pretty good at proc’ing bleeds from Sharpened Images if you have enough crit chance.
Guardian and Ranger definitely don’t really fit a condition GS build. Not sure about Warrior as I don’t have one of those.
Ranger or mesmer but you need to play with your builds. Condi is great but limited where in game it shines. If you don’t have a condi build you can always unlock the skin and save the greatsword until you have four exotics to throw in the mystic forge.
No one does. Ranger was the class that did but then they changed the Bleed stacks on Maul to Vuln stacks (and even then, it was kind of an iffy set to use for that purpose). So no one gets any benefit from Condi Greatswords.