When you get the game too easy, there is complain
When the game gets harder, there is complain
What is wrong with GT5 Humans ?
What actually do you Humans want from GT5 ?????
Maybe searching for and reading the many threads on what poeple think about GT5, both positive and negative, would answer that question better than any one person.
Different people want different things, different people play the game in different ways, have different skill levels and also have different ideas and expectations.
On any game there are always going to be some complaints, that's the law of averages, the thing about GT5 is that it's somehow managed to make the majority of people (including die hard GT5 fans and enthusiasts) unhappy about at least one thing or in some cases, many things.
The situation is not helped by the fact the game was delayed for so long, people were already frustrated, and when the game was finally released it did not seem fuly 'complete' or without flaw, which has resulted in 3 updates (in the first month) to correct general issues rather than issues of a personal opinion from one particular person.
This again was not helped, by the pre release statements that Polyphony kept delaying the release of the game because they wanted it perfect, which it was far from. Also, add to this the fact that certain features we were told would be in the game, but aren't, means there has been a huge backlash from people who are venting their frustrations about the situation.
As mentioned on other threads, alot of people care about Gran Turismo and for them to be treated like this, it is only natural there are going to be many people who are expressing their feelings, which, owing to the above mentioned scenario, just happen to be negative.