Now that overall ratings for 2K19 are starting to come out, please take time to try to understand and remember the following.
Overall Ratings Are Position-Dependent
NBA 2K games assign an overall rating to a player based on specific skill attributes whose significance to overall rating are weighted by assigned positions (PG, SG, SF, PF, and C). This means that the calculations for overall rating has a degree of dependence on which position a player is listed at. For example, point guards with higher passing stats are valued higher in the overall rating formula than centers with high passing stats.
Player Example: Nikola Jokic, the center for the Nuggets, is a very skilled passer who is likely to have higher passing attributes than most centers. However, the game does not place significant overall rating value on passing attributes for centers. Instead, centers will boast a higher overall rating if they possess high attributes in rebounding and interior defense.
For a player like Jokic, his true value on the court won't be represented accurately by an overall player rating because the overall rating calculation system in 2K doesn't value his passing enough - simply because Jokic is listed as a center. This means that Ricky Rubio's passing attributes carry far more weight in an overall player rating than Nikola Jokic's passing attributes, even though Jokic is such a vital playermaker in the Nuggets offense that he rivals opposing teams' point guards playmaking ability.
Overall player rating isn't a big deal because it does not accurately represent a player's value in the game. If we had a system that truly values players' attributes on a 1:1 scale, regardless of position, then an overall rating would matter more. But to debate cross-positional overall ratings and say that point guard [x] should have a higher overall rating than power forward [y], or to say that certain players' overall rating make them overrated/underrated just doesn't really make much sense without questioning the current position-centric system of overall rating calculation that 2K implements.