Sure some of the things people complain about amaze me, however most of the complaining is justified though it falls on deaf ears. People are not generally complaining about it being worse than the previous incarnation, they are complaining about the same things they complained about several games back that still have not being addressed!!!!
That said several things were released as updates in GT5 because they were useful that they forgot to include in GT6.
Its been going on so long perhaps now we bitch at the slightest thing but let me ask you just a couple of things.
Why have a single player mode at all.
1) You cant use tyre wear, realistic slipstreaming etc, etc.
2) You cant set up logical race opponents the game picks very random stuff most of the time
3) Can forgive point 2 sort of as modelling the cars is honestly pretty pointless in single player as the AI is so bad you can often keep up with a supercar in a hot hatch.
When your stock Integra stays with or even closes on the Viper its slipstreaming down the straight you have to ask yourself why your actually playing.