first off take everything you thought was bad about NBa 2K12 (developer's mediocre understanding the rules and everything else basketball for that matter, glitchy movements, players not playing their positions correctly, etc.) and make it worse. then take everything else and break it too and you've got a pretty accurate description of this game
i know being a famous black rapper makes everyone want your products but was it really that smart to let the guy whos team set the NBA record for WORST start of all time executive produce your game? Jay-Z's complete lack of basketball knowledge is made more apparent in this game
they made the reach-in fouls super extra sensitive so like 7 times out of 10 you'll get called for it. the movements are so glitchy now that its nearly impossible to play tight D without going into post def. position. the AI blatantly works against you whenever it feels like - BS shots fall like free throws, your player will stumble or the button wont register and your man has free points, shorter players will come up with 3 or 4 or 5 offensive rebounds in a row, wide open perfect quality shots (A+) you put up will bounce off the rim (usually out of bounds), etc.
about the improvement over NBA 2K12 is the player stats seem to have a larger effect on overall preformance