My guess is you are a Rookie in iRacing? and you are frustrated because you find the physics are difficult.
Don't get me wrong Cote, i liked GT5, i got level 40 in both disiplines in only 3 or 4 months after it came out. GT5 is fun to play, the GT cars were my favorites and we had many fun races. We never used any assists anytime, just straight out racing, i had a good many friends that raced together.
i have been at iRacing for 14 months now and i am sitting at a "C" license ATM, i could get my "B" license in a couple weeks if i wanted but now that i can race the Riley proytotype i'm going to take it slow. When i compare to where i am now in iRacing to the end game of GT5 i know the physics are not the same, as i mentioned, GT5 is a game and iRacing is more of a service.
i am not the fastest racer by any means but i know that the physics, tracks and cars in iRacing are much more advanced, if you don't see that then that is youri opinion even if it is wrong.

Enjoy your racing, that's what we are all here for.