I think Aya's quite okay actually. Sure, Maximum Spider is possibly one of the toughest and more BS lvl 4 attacks out there, but MoF gives you shitloads of bombs, it's not like that attack will burn out more than one (her STAGE on the other hand... oh gods, the horror).
I also think that Lyrica's non-spells are quite okay. I'm much more comfortable dodging those straight bullets that evading those damn ghosts merlin throws at you (Laser part is easy, though).
I (now) do somewhat okay against Youmu's spells but her normal attacks are usually blitzkrieg. And personally love the whole Yuyuko fight. Someone there mentioned Eirin. I think that (Apollo13 aside) she's way more enjoyable than Kaguya who just seems like a random stupid girl with a silly sprite that throws random coloured bullets at you.
Finally, anyone that says that Virtue of Wind God is more enjoyable than Ressurection Butterfly: -X% reflowering must be on crack. Hard it this, fun it is not u.u