Taking two turns in a row is undoubtedly incredibly powerful, especially in a format where two- and three-prize Pokmon make up the bulk of attackers
While it's an easy monster to Special Summon now, effects like this were rare when it was first released
Of course, as I always say, a card is only as good as the context that surrounds it, so if there are not that many good fighting attackers, Barbaracle wont be as strong but I honestly think it is a fantastic option that immediately makes new fighting types a greater threat
However, compared to staples like Baronne de Fleur (omni-negate + pop), Borreload Savage Dragon (repeatable omni-negate), or even the original Stardust Dragon in certain protection roles, this card is more situational and less universally powerful because its negation condition is restrictive and once-per-turn locked per effect
Theyve often experienced collectors and avid Pokemon fans, so theyre more willing to pay a high price