The art isn't the best, but not so bad that it's difficult to understand what's going on.
Excuse me what? The art is one of the best parts of this manga. It has a very distinct style. I think it's pretty nice (even if the outfits are a bit too fancy).
In this case I'm with you.
And in another note, I can understand why Marika wants to go to her world first, because even if you guys had forgetted it, she has a partner (?) so I bet she first want to talk with them.