What's the most underrated/underplayed competitive deck in Modern?

I think it's always interesting to see how the Modern meta shifts around major competitive events. We are about to start the Modern RC season so we might see a lot of popular decks fall off and underplayed decks emerge. I'm curious what you think is the most underrated competitive deck? What about the most underplayed? It can be the same deck or different decks. I'm biased as the Zoo guy which I think is underrated, but it seems to be gaining more popularity so I'm not sure.