I have played all the GT series games as well, i remember watching the promo videos for the original GT game on PS and was so impressed. However, i too am deeply disappointed in the retail version thus far of GT5. I personally do not understand what exactly took so long to get this game to market. Maybe PD is spreading themselves too thin with all their real world engagements, or maybe it's time to hire some more talent to help. I was expecting much more in this installment of the GT series, but this just looks like more of the same with graphics improvements, and engine updates to stay current with rival products. Whatever happened to the promise of using GT5

data for a headstart in GT5? Did they simply hope we would forget about that?
If the hope is that the online ability will carry GT5, then i believe online racing options should be much more detailed for the host. Such as being able to pick 'class' types for races, such as Supercars, 4WD, Midengine, Turbo, NA, and so forth. Also being able to not allow cars that use front adjustable downforce, so the host can do a streetcar only race w/o having to do it verbally, and with a pre-existing knowledge of what cars have front df. Maybe even allow for a five race championship, or any number of race championship.
I do like the idea of a B-spec race series, but it does seem kind of like a cheap add on. But one thing i don't understand is, why can't i race against my own B-spec drivers? Even if only on a practice session.
Like a previous post mentions, so many great ideas exist on this board and on the feedback section of this site. Plus so many of them seem like an easy thing to implement into the game, although i am no programmer. The career mode of the GT series does not seem to have evolved since possibly GT2, maybe not at all depending on how one views it. Come on PD, i love the GT series, and i currently play the hell out of GT5, but so many simple fixes and improvements could send this game over the top.