This isn't Madden NFL where just because you rush for 200 yards in a game doesn't make you a 90 overall running back. You must also factor in the help of the Offensive Line. Maybe the 81 overall running back ran behind a solid Offensive Line. NBA 2K Insider knows what he is doing, and I admit the rating scale should be tweaked but it is the player's ATTRIBUTES that are nearly accurate to represent the counterpart of basketball player on the court.
For instance:
Lopez (80 OVR) [Considered Overrated]
Inside Game: A-
Outside Game: F
Perimeter Defense: F
Post Defense: B+
Ball Handling: F
Rebounding: B- [Weakness]
IQ: B+
Roy Hibbert (79 OVR) [2012 ALL STAR]
Inside Game: B
Outside Game: F
Perimeter Defense: F
Post Defense: A-
Ball Handling: F
Rebounding: B [Better than Lopez]
IQ: A-
Tyson Chandler (77 OVR) [DEFENSIVE PLAYER OF THE YEAR]
Inside Game: C+ [Weakness]
Outside Game: F
Perimeter Defense: C
Post Defense: A
Ball Handling: F
Rebounding: A-
IQ: B+
Chandler and Hibbert are both better than Lopez according to those letter grades. Lopez just has a better Inside Game.

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