Recent 2/3* guys that made it into the NFL and are doing well:
Emmanuel Moseley - 2* - Still in NFL
Cam Sutton - 3* - Still in NFL
Zach Fulton - 3* - Still in NFL
Justin Coleman - 3* - Still in NFL
Current players that are contributing:
Jeremy Banks - 3*
Cedric Tillman - 2/3*
Theo Jackson - 3*
Trevon Flowers - 3*
Aaron Beasley - 3*
Byron Young - 3*
Velus Jones - 3*
Javonta Payton - 3*
Jabari Small - 3*
3* guys are at the top for sacks (#1,2,3,5), Tackles (#1,2,4,5), Rec Yards (#1, 2, 3, 4, 5)
So while there are 10 3* guys that wash out for every 1 that doesn't... that isn't to say you can't glean an idea on how well scouted by actual pros (not just a scouting service) by who offered him. OL and DBs are especially hard to scout given a lot of times grades are given based on production and you won't really see much production from OL or good DBs.