Onakado sensei is easy to keep up with, if you are willing to do more than just show up to class. Studying lecture material for even just 30 minutes a day will get you an A. However, she will surely call on you for participation, so you barely get a chance to slack off which might provide the structure you need to learn japanese. I hope this helps.

If you seriously want to be master in Japanese, her strict guidelines and discipline will make you a master. Seriously consider your level of interest in Japanese and then make your choice.