Agreed, I basically give 0 fucks about the majority of these "grades". There are a few guys whose opinions I respect and put more credence into, but overall I trust myself more than at least 95% of these guys.
I (and we as a board) generally understand the Cowboys and the nuances of the roster/philosophy (i.e. how they're going to use Williams) than pretty much all of these media guys, particularly the national types, and I personally have more experience evaluating and writing real NFL-style scouting reports than all of these media guys except the actual former scout/front office types like Jeremiah, Riddick, Mayock and so forth.
So ultimately it's interesting to look at but I'm going with my perspective over the rest of this noise, and especially over these horse shit Rotoworld/Bleacher Report types.