That's a freaking horrible analysis. I'm a saber guy myself, but this guys application is as dorked up as I think you can get. There's no way Griffey is one of the worst full time starters in the history of the game. I'm by no means a Griffey fan myself, I don't want him on our team. But I don't even have to think hard and I can come up with several examples that I don't think anyone would argue are worse than him. Many of them former Cubs. Neifi, Jeff Blauser anyone? Thats a pretty hardcore saber retort you just provided there... And Griffey just scored one in the mgl column in what will most definitely go down as the great saber Griffey debate between Jericho and the #1b guy in all of statistical baseball analysis. Let's see here..."Convert those CF numbers to RF (add +8 or +10 maybe?), take a weighted average, age adjust, and then regress to a 39 yo player with a terrible speed score, and I guarantee you are going to get a number a low worse than -15." Yeah, that sounds real scientific. Add on top of that, no disclosure of how he calculates "throws," coupled with arbitrarily giving him -5, I don't see any real analysis. I see abuse of metrics. Add the common sense test on top of that. You can't seriously assert that Griffey is one of the worst regular players in the history of the game. He did, but he didn't offer up any comparisons whatsoever. He must not have done any research whatsoever before making that statement. Just think about that one, who all could be considered as worse players of all time? I wouldn't even consider Griffey for worse regular player of the 2000s, much less all time. First addressing the "worst player of all time"...I take that as a hyperbole. You are absolutely correct he didn't test this against anyone else (or more accurately say "projects to be" the worst player of all time), but I can put my critical reading hat on too and come to the conclusion that it is meant as a hyperbole. And as for the defensive metric, yeah, thats pretty scientific. Does he spell it out exactly how he calculates all of those adjustments? No. Does he really need to? No. He doesn't need to prove his credentials to the people reading the comments of his own blog? If you don't think mgl can calc weighted averages, age adjust, and regress, then just ignore anything anyone posts about him. He uses UZR, weights based on how recent the experience was (I think 5,4,3,2). 8-10 runs is a pretty well accepted adjustment from CF to a corner. Actually, when I did it, I got a -23 run player on defense alone. He explains a little deeper how he comes up with hims arm ratings a couple posts later. In case you didnt realize, this is a blog and these were blog comments. They are quick and dirty estimates that aren't meant to be terribly exact, but when you are talking about a couple runs, you aren't going to make a material difference. This isn't a written article or anything. What should be gleaned from mgl's analysis is that A) Griffey's defense is terrible and much worse than what people perceive it to be and B) aging has caught up to him fairly significantly making him much worse than he actually is vs what people think when they hear the name Griffey. They think prime griffey, but hes way way past it.