I'm not the one guarding the players, for the most part in MyCareer my man never scores over 15 Points. (Lebron being the exception)
As far as inside, its not moving per-se but its Noah and Gasol constantly being out of position and not actually guarding their man, vs the Spurs Gasol hangs out in the paint and lets Aldridge destroy him from three.
Vs the Hornets, Jefferson had around 7 dunks if I'm remembering correctly because Noah was not actually playing on him, He was in the area but not close enough to actually make a difference. Leading to Jefferson dropping 40 and 13 on us.
In post up situations we pick up a LOT of fouls, Noah averages around 3-4 a game due to post-up foul animations. Has gone down since switching back to default.
But also in the post Noah blocks a good bit of shots, but its not posting that is the problem, the problem is the A.I doesn't seem to know their matchups strengths. (Aldridge being a great shooter) and allows for the other teams bigs to kill us.
On the perimeter as you said, Rose is a problem. He struggles to guard Pierre Jackson (76ers). Butler usually locks his man up, but their has been times where he gets ran off of screens the whole game and never adjusts (going over the screen/switching) and he keeps getting killed, an example is vs the Warriors or the Mavericks where he guarded Parsons and allowed him to score 26. Its just simple things that if they get fixed enough to give them some type of a chance vs lesser rated CPU opponents, then the game itself would be great. I kill the CPU as a player (6'8 SF, 88 OVR), recently got posterizer. But alone I can't do the "Play like a HOF'er to win" theory. I do it every game, but it just doesnt work.