As far as I'm concerned, we need to repeat the same things as many times as it takes to get an acceptable response from PD and/or Sony as to why the game lacks features that are printed on the back of the box. Simple as that.
For what it's worth, I'm emailing them as well, but part of my motivation for starting this thread is to make it clear to them (presuming they, or someone with enough clout to pressure them, read these forums) that we haven't simply "forgotten" that there are features missing from the game.
With the general attitude towards the game on here, it is very easy to just roll over and say "oh well, maybe they'll patch it in," but as consumers we deserve better. What makes it even more troubling to me --and I don't want to get too speculative -- is that from his statements through the development process, and even now, Kaz conveys the impression that he thinks of himself as an untouchable auteur that can't be bothered with piddling concerns such as delivering the product described on its packaging. The popularity of the Gran Turismo franchise, and the fact that it generates millions of guaranteed sales, doesn't excuse misleading buyers and delivering an unfinished product. If he actually cared he would express SOME concern and goodwill over the missing content, not just "Yeah we're working on that, it'll be out at some point."