I understand that Paladins are not the same and I assume that the Holy Warriors abiding to the Oath of Vengence will be able to do things which would make the other variants "fall".
But IMO the main problem is that Oath choice should be moved to 3 lvl. And Oathbreaker be made a player choice and renamed Oath of Might Makez Rite opr something like that. Oathbreakers would have to either play with part of their abilties blocked (in EA the loss is no biggy for me) or pay 2000 gs to atone.