The problem here imo is not trivial things like the ring bending or a logo on the headband, I'm not fussed about that. The problem with those who are impressed is that they fail to acknowledge the fact that the player models (like Dwight's face looking plastic as pointed out earlier) still look cartoon-ish which for some kills the experience. The gameplay may end up being good, but I don't want to be playing a game that looks like a cartoon when I could be playing a game from 2K that more accurately represents a real-life broadcast. I also think the animations aren't as fluid as 2k's.
I know it's far from perfect but, in my opinion NBA2K9 looks more impressive. I know this trailer is a WIP, so I hope the finished product is more impressive.
Cheers