Not much else to say. Sky high attack, hits harder than SD Arceus after a Hone Claws, with great defense and typing to allow it setup on threats such as Tangrowth and users of weak physical attacks. Sure it does have checks, but the Choice Band set 2HKOes/OHKOes almost all of them with proper prediction (or even no prediction at all). It's also very fast, outspeeding a lot of important pokémon that would check it, such as Entei. For those reasons, I think Durant makes the metagame unhealthy and should be banned.
Sharpedo: No Ban
While I think Sharpedo is pretty overpowered, people have convinced me that it's not broken enough to be banned. It simply lacks the raw power to break through defensive cores, and offensive / balanced teams almost always have something to deal with it, be it either something bulky enough to survive a hit or priority. It also has a lot of counters, like Ferroseed, Poliwrath, Alomomola, etc. For this reason, I think it should be RU for at least another round.