Against humans though, she's amazing <3
She's amazing for story mode, too. Just finished yet another lunatic 1cc which failed to save (probably the 12th or so that I lose to the save bug, 7th or 8th with Mystia - only four successful runs ever saved instead of crashing to desktop, one with Reimu, one with Cirno and, interestingly enough, the Aya/Medicine no-focus no-vertical ones).
Died three times to Shikieiki, until she finally went down in *gasp* 2:24! (I
never expect Shiki to last less than three minutes, and three minutes and a half isn't unreasonable for Mystia)
Score was horrible, though, and didn't get even close to making it into my Mystia top 5. :V