Report Card Grades for Every NFL Roster Heading into the Draft

Which NFL teams have done the most to improve themselves in free agency this offseason, and which teams still have lots to do in the draft?
To sort that out, I've graded every roster in the NFL heading into the draft. While I'm sure there will be plenty of discussion in the comments section (these are subjective, after all), I made every effort to be as comprehensive as possible.
The grades may not match up with a team's win-loss record in 2012—a credit to the work they've done (or failed to do) this offseason. Other teams may be far better in some areas than others, resulting in a higher grade overall but still not relieving them of a clear Achilles heel. Still others have gaping holes sure to be filled in the draft or the post-draft free agency period that could seriously improve their current grade.
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