Is it fair for players to face an extremely broken pokemon ? The argument of rarity isn't one, you can't go hunt for a Uber poke and then complain because it is/will get banned.
This is valid for all the tiers, expect LC and Uber (maybe other ones but those are the most used).
And uber ban are voted by majority (60%+ not just 50%)
Why even discuss if this stupid argument come everytime (don't misunderstood me, i'm not insulting you).
Of course every poke can be countered (well expect mega rayquaza but even him can be (sometimes) killed), but that doesn't mean they aren't OP, Mewtwo can be countered, but everyone here will agree that mewtwo is stupidly OP and should never be allowed here, same goes for other pokemons like h.a gothi or h.a blaziken.