the "building" statistics in general statistics is a good tool to estimate how well one is doing in the early game. the more buildings one make, the better. it is however faked by the fact that the statistics consider every construction site. A planner like myself, who is going to put down the construction sites for many advancced buildings without starting them, just to organize the space, is going to be overly represented in the building statistics.
So, it would be better if such statistic only tracked buildings that were actually completed.