I don’t know. Regina has certainly had her victories.
True. But most of her victories have been against Emma. But those don’t hold much value because Emma didn’t know what was going on. She wasn’t aware of the curse. But I guess successfully casting the curse could count as a major victory for Regina. However, that’s more of an example a victory inside of a victory. Yes, Regina cast the curse, but it was really Rumpel who wanted it and knew the true nature of it. I guess that’s why Regina hasn’t been able to successfully enact revenge against MM yet. The curse wasn’t designed for revenge, it was designed to find someone.
But now that magic has come to Storybrooke, I think Regina’s success rate may go up. 😉