Nero wins by a landslide. He managed to not only enact his revenge against Vulcan, but have two Spocks watch it. It wasn't his complete plan, but pretty sure no other Romulan had anywhere near his level of success.
Valid points. Too bad he lost everything in the first place--his planet, his family, his universe, his hair, his dignity, his marbles...
However he also unwittingly may just have saved Romulans in the Kelvinverse by announcing the nova of Romulus' star in a century or so. Plenty of time to relocate the population. Prime Spock probably got the ball rolling on that one despite his grief.