I feel like some people are relying far too heavily on completely unproven ranking systems to determine the value of football players. Isn't this like the antithesis of NSBB? I mean, I understand that baseball advanced metrics are a million times more reliable and proven, but there was a time when they weren't as widely acclaimed. Also, there's a lot of discussion of PER in NBA threads, FO ratings are used as gospel in most NFL threads, and even pass blocking efficiency (which is the ranking system I assume you're referring to) has been used to make many an argument without being questioned. Why all the sudden is this system "completely unproven"? I may be in the minority, but I think it's just as ludicrous when people value a baseball player solely on WAR. All numbers are useful, but determining a player's worth based on one number or formula isn't that helpful. i don't want to get into a discussion of WAR in the bears thread, but WAR is essentially a formula based on a lot of numbers.