There's a new version of War2Observe that fixes the crash issue, download from the downloads page today!
pball will have high numbers since the average game lasts 2 minutes, you would need a formula that divides the number of times a map is hosted divided by the average game length to give an accurate measure of how popular a certain map is.
Would it be a lot of work to display how many times was a certain map hosted? for example from the last month?