With the removal of Pursuit and introduction of Poltergeist, I think Ghost has been elevated to at least a top 3 typing, putting it alongside Steel and Fairy as one of the best types in the game.
Defensive Normal types suck ass for the most part. Only Chansey is good and Chansey loses to most Ghosts 1v1.
Defensive Dark types also suck ass. There is basically only Mandibuzz since Tyranitar is a shitmon now.
I definitely think Ghost is better than Fairy offensively at least.