I love the War Room because of the way it organizes its draft board by ranking and round. And also because Dennis Green says he and Rod go by Best Player rankings.
But that doesn't mean the War Room is close to being right in their rankings.
For one thing, their stuff appears on newstands a week or so after the Combines, which means they probably go on press before the Combine results are made public. Which means they're not working on information from the Combine or Pro Days (which not necessarily pivotal, can tweak a player's overall rating somewhat). Which, in turn means they are working on information that can be outdated by as much as 7 weeks.
This, in turn, brings up another factor: You've got to figure that the way various teams grade out players, there can be as many as 20 players who grade out within a point of one another (i.e. all twenty players could be rated, say, at 88.5 and basically tied at #100 - #120. All you'd need is for last minute Combine or workout results to cause a player to go up to an 89.5 or down to an 87.5 and his ranking could jump to a #80 or drop to a #140).
The War Room, therefore, is great in that it helps us structure our thinking the way Dennis and Rod do, but by its very nature, is likely to give you evaluations that are somewhat "off" and should be taken generally rather than specifically.