I would only take the time to evaluate my partners if my assigor would use the evaluations as another part of his evaluation "formula" . Our baseball assingor has a "formula" that he shares with everyone. Not sure where all the numbers come from, but at lease you have something to compare.
My softball assignor makes up his evaluations. He does not see his officials and does not know what he is looking at anyway, since he thinks the game is still being played as it was in 1971, and most of our umpires are officiating like it is 1971 and the coaches like the 1971 vintage method. Most are happy, except a hand full that know better and have a baseball background.
My volleyball assignor "looks at" peer evaluations, but I do not think these evaluations have any bearing of our over all final ratings.
Be honest with yourselves. Do you really think any of the information used by any assignor, would change someones final rating position more than1 - 2 places? I don't think so. Keep in mind, the assignors have the final decision, and it almost always come down to the good ole boys. Just the way it is.