It can be done to a certain extent, but there's not quite enough data yet. In fact, diditclear just posted about this over at the main data project thread: http://www.flyertalk.com/forum/20513450-post46.html

I encourage you and everyone else to add data to make the site more useful.

In any case, my general comment stands: things have gotten worse since the overall stats on udustats, but not as insanely worse as people seem to think.