The IOS app has absolutely perfect statistics for me:
#Added, #Modified and #Completed
This lets me know:
1. Am I taking on more tasks than I can handle (#Added- #Completed)?
2. Am I actively reviewing my tasks (#Modified)?
But sometimes I don't carry my iPhone and want to view this really simple information on the TD web. But I can't seem to find it. It's possible to get close by using the fancy graphs, but this takes a lot of thinking and clicking, neither of which I enjoy doing ;)