[Nyara]

Rapid Spin, broken? I will just lol, sowwie. It's a good move, granted, it's maybe the best support move of the game, granted, but that's just because how overpowered is Stealth Rock, and how it hinder the 30%+ of the entire metagame, and nothing stop your hazard setter of just do it's job again, while the spinners are offen KOed without any major trouble, as they had to waste a switch-in, the turn to use Rapid Spin, and comeback once gain to Rapid Spin one more time, in other words, they need to handle almost 3 turns of attacks, and that's a hard task, really hard, and more when you consider the Rapid Spinners are weak to hazards, generally.

Also, the unique reason to carry a spinner is when you carry one of those Pokémon that form part of the 30% hindered by Stealth Rock, and a good player should always carry a check or counter to Bug/Flying/Fire/Ice, as they are important types, even if on our current OU it doesn't looks like too much thanks to Stealth Rock, but a good player should not counter/check 4 entire types with just a single hazard move, that's silly. And some use spinners for some stall teams with cores that needs of a lot of switches.

It's not really that hard to keep rocks on the field, spinblock with a ghost if you need to keep rocks and stuff ALL the game, otherwise, just predict the switch-in of the spinner, attack it, attack it, and attack it one more time when it comeback, you're done, set up rocks again, be happy, you don't need to transform Rapid Spin into an entire support move for keeping it at the field.

After all, you just need to take care of 18 users of Rapid Spin, that's the complete number of users, and of those 18: Sandslash doesn't work outside of Sandstorm and is countered by the same that counter almost any Sandstorm attacker, Hitmontop and figther friends are too weak to even switch-in at all, Torkoal is weak to all hazards, Claydol is useless apart from Rapid Spin, Excadrill was banned, Cryogonal is weak to Stealth Rock and it's physical defense is literally thin paper, Tentacruel doesn't work too well outside the rain, Kabutops can't take hits, Delibird is Delibird, Spinda is Spinda, and Armando is weak to all hazards. So, Forrestress, Starmie, Donphan, and Blastoise are the unique trully "good" users of Rapid Spin (with the niches of Tentacruel under the rain, Sandslash under the sand, and... end list), and it's easy to handle them on the team building (STAB Grass ends 4/6, HP Fire Forrestress, Earthquake the last).