The sim is better now than in the previous couple of versions, AND some major updates (including and especially the release of the 09-10 player seasons) are way overdue. I'm scaling way back on my WISNBA play (I don't intend to run more than 1-2 teams for the foreseeable future), but not really because of technical issues with the sim.
Some of my cutback is due to simple household economics...I need to spend the cash on other things. But the rest of the motivation is the staleness of the game. Absent some combination of the new player seasons, adjustments (hopefully in the direction of realism) to position efficiency and defense ratings, and changes to the relative valuing of offense and defense, most leagues are giving me an acute case of deja vu. There are only so many times I can slice and parse and tweak rebounding percentages, shooting efficiencies, etc., before I start to wish some different emphases were possible. The saving grace right now for me are progressive leagues and to a lesser extent draft leagues, where limitations in the set of available player sets constrain the ridiculous redundancies and excesses that are otherwise possible. Also, with a few important exceptions, those kinds of leagues don't depend on the newest possible player seasons.
I'll keep dabbling in some of those leagues, but I'd love some adjustments to the sim that shake up team-building and game strategy. All-time greats like Bill Russell, Isiah Thomas, Scottie Pippen and Sidney Moncrief are almost more trouble than they're worth in this version, and guys like Pettit, Havlicek, Schayes and Barry are essentially unusable. We need at least a slightly different gameboard for the long list of "what if" questions to remain interesting over the long haul. Even a simple adjustment like allowing for variable league sizes could (I think) have a significant positive impact by allowing progressive leagues to start a good 15 years earlier and enabling lots of theme leagues that don't have quite enough interest to fill 24 teams.