The interface on the current Android version is clunky at best, but it has been updated recently to make it at least a little easier to navigate. The previous version kicked you all the way back to the main screen when you pressed the back button from the forum. This one just takes you back to the main forum list.
My main complaint with the current Android version is that when you navigate to the subforums you have to scroll through the full list (including two for each state under events). It would be nice if the child forums only opened up if you clicked on it.