My suggestion here is simple, to ignore (or add a checkbox for) any maps that fall under "Montly Beatmapping Contest". The reason for this is that these maps are constantly on the top and (in my opinion at least) aren't even that good. They're obviously in the top because the game comes packaged with them now, and they obstruct other better maps in that list.
Right now 3/5 of the top played maps are under this category. As we get more of these maps it might very well turn into 5/5, effectively rendering this section obsolete.
Hopefully this is taken into consideration.