I don't think so. In fact, I think it should be default Neutral Evil.
While Good Vengeance Paladins can potentially exist, the fluff of the class seems to suggest to me moreso the kind of person that obsesses over their vengeance until it consumes them. To swear vengeance so deeply that it gives you supernatural powers doesn't say good things about your sanity. The flavour text of the subclass says otherwise, but has anything good ever come out of unbridled lust for vengeance? The most fitting story for that Oath is of a person who fulfills their vengeance and brings ruin to all who wronged them and defiles their legacies forever, only to walk away with the feeling that it was all a waste of time.
Vengeance feels empty. (warning: TVTropes link)
There's a saying that's bandied around in many forms, but the most common is "Before you embark on a journey of revenge, dig two graves," with the implication that the first grave is for the target of your revenge and the second is for yourself. People often attribute the saying to Confucius, but it's more likely that it's an adaptation of the Japanese phrase「人を呪わば穴二つ」- "if you curse someone, there are two holes."