A lot of companies are doing this now, releasing product at a point in the development cycle where it's usable but still needs software updates to complete. I always assumed it was a cash flow thing where they needed that flood of income to keep production going on the project, which can be frustrating, but if it brings games to completion that otherwise would have gotten canceled in the dev process, I'm not sure it's a terrible thing.
The real issue is that there needs to be a certain amount of trust the customers have in the company that the games they buy on release will be completed, which is where it sounds like a lot of the complaints are really coming from. Seems like finished game code means something different to everyone once they play it in an unfinished state.
For some minimal perspective, the TZ "bug" of shooting the camera to score a powerball jackpot in powerball mania is just accepted as part of the game and not a sign of William's QC capabilities or that the game was not completed. Also the lack of third magnet that it was released with and the fact that the magnets only work on multiball start in one specific scenario. These are pretty minor, but seem somewhat analogous to some issues taken with some Stern games (though not comparable to the code state their recent games are released in).