Hey anon, I just finished watching it last week. Here are my thoughts.
The sailormoon thing goes on all the way until episode 19 - 20, then Ninja Guitar Battle happens. Every stereotypical thing you saw about a Shoujo anime is broken down by then, but before that, yeah expect a lot of monster of the week scenario and fawning over cool male leads, not that it doesn't serve a purpose in the plot though.
The last part of the anime also answers all of your questions you had in the series, so plot wise it is very solid.
Overall I say if you enjoy ballet and classical music, this series should be a favorite of yours. A lot of 'battles' didn't make since to me until I understood how to watch ballet. But if you are more of the action type, you should still watch it for the Ninja Guitar Battle finish.