I think the issue is that TIMING TOO OFTEN MEANS NOTHING. Difficulty of a shot is already determined by skill rating (when my guy's ratings sucked, he rarely got an A+ shot selection, and I was always slightly early or late with timing). If you are good enough to have both an "Excellent" timing grade and "A+" shot selection, then your player should make the shot. I just played a game against the Pelicans where I set screens and had the PG pass me the ball for wide open spot-up shots, and had excellent timing & A+ ...only to miss badly all 4 times. My player didn't have the ice cubes over his head, nor was he tired. Why did I miss? Because an NBA player would miss 4 wide open 3 point shots in real life? I agree that 2K did this to make it "realistic"...but what's the point of having timing if it doesn't matter? It's like the game randomly makes you cold for no reason. Don't get me wrong, I've gotten pretty good. My player averages over 50 PPG. But it is annoying to miss wide open shots for no reason. And, ironically, my player always seems to toss up a brick as soon as the "on fire" icons pops up over his head.
Passing can be a joke. All too often, I will make a perfect pass and my teammate will miss an open layup, miss a dunk, or decide to wait for a defender to pick him up. It can be frustrating to try to get assists. I find that I mostly get them by passing to open 3 pt shooters, and not to anyone in the post or in transition.
Close games feel predetermined, and unpreventable. Because I do tend to score a lot, my teams score lots of points. So my games are either major blowouts OR close losses because the opponents can magically make 60% of their shots. Yes, the Pelicans just did this to me! Tyreke Evans turned into the love child of Michael Jordan and Ben Wallace...he hit 3's over close defense, zoomed past defenders for dunks, stole a ton of passes, blocked drives to the basket, stuck to my player like superglue if he took more than 2 steps with the ball. It was quite ridiculous. But I set screens, made some shots, forced fouls, and kept my team ahead by 1-3 points throughout the game. Then the AI decided that my teammates no longer wanted to pass me the ball in the last 3 minutes...and Tyreke put my team away.
TLDR: True, the game is made to be realistic. But shot timing should mean something...especially if you really are shooting a perfectly timed & wide open shot.