Interestingly, judging from various Japanese message board posts, there do seem to be arguments about what should be considered legendary and what should be considered rare, so it seems its an issue thats not necessarily localization-caused
It's also a 10/10 flavor win: Marchesa has dethrone in Conspiracy and becomes Queen Marchesa (and with the monarch!) in Conspiracy: Take the Crown
not a bad deal, in my opinion
Quick Balls success rate is significantly better if you play a very low amount of Pokmon, and becomes comparable or even higher than Pok Balls in certain decks, but for the average Stage 2 or SP based deck, Pok Ball offers the best chance for you to get the Pokmon you need, exactly when you need it
However, if the odds are not going well, players might also choose to charge up Mew's Genome Hacking to use an opponent's Active Pokmon's attack against itself
She is an archangel tasked with watching over the gothic-themed plane of Innistrad