Quote:
Originally Posted by IrishHand
How we - or at least most fans - rate NBA players defensively really is flawed. We get our info from sportscasters who are, by and large, not that insightful and would rather say something interesting and sensational than factual. We tend to infer a positive relationship between steals and defense - even though there are legitimate arguments that that relationship is an inverse one for most players. Same for blocks.
When a more legitimate defensive metric comes along, we tend to react with great suspicion largely because it will likely fail to match up in our minds with, imo, a flawed intuitive understanding of that topic.
I'm far more persuaded by Session's amazing opponent eFG% that he's a very good m2m defender than I am by the passionate arguments Celts fans tend to make in favor of Rondo being an elite defensive PG.
It's hard to make any definitive statements from this one metric, but I think it can definitely lead us toward better analysis of players.
Sessions numbers really are incredible. He basically neutralizes his opposition's offensive output, and does so at a pretty good volume. He ranks about #100 in terms of volume against, but he's around #375 in terms of value against.
For all the bitching about the Lakers PG defense, Fisher is right next to Rondo as about the 250th most abused defender in the league. To be fair, Rondo adds about 0.3pts/g in steal value over Fish.
I know people have done stuff like track AI's opponent production over a number of games and laugh, and my numbers (he's #20) seem to back it up, but there are a number of guys out there whose defensive reputation does not correlate with their counterparts' production, and it's going to take good reasons why I should expect a player's value to lie in other areas for me to move away from counterpart production as a main defensive stat.