[themccannman]

The idea behind DPR makes sense, however when used in practice it's wildly inaccurate and I would recommend not using it. Our team's defensive ranking system so far has proven to be extremely successful so far. We have 4 purely subjective categories pertaining to a robots ability to play defense and their actual defensive performance, and 2 defense scouts (one per alliance) to rate each individual robot. At the end of qualifications we compile the data into a spreadsheet with predetermined weighting for each category and it spits out a couple of numbers that tell us exactly how good every robot is at doing the things we are interested in. The most important part of our system however is that you need experienced people who know what to look for in a robot to be able to adequately judge their performance otherwise your numbers are worthless.

Edit: the person above me basically covered most of the categories we use to judge robots. We use:
-Drive train speed
-Driver ability
-Height (< 30")
-Blocking performance

Only the last category is actually affected by robots playing defense, the rest are affected by their apparent ability to play defense if we need it.