I am the GT god, underneath my problems that lie mostly within a lack of speed! Honestly, i have no idea. I'm pretty decent but it depends on what you mean.
You have
> The time trialer, a guy who will analyse and practice a track to perfection, chasing tenths by breaking down the track into small sections to perfect.
> Improvisational driver, who can jump in and adapt quickly and perform well in many scenarios, but not necessarily the fastest in a time trial.
> Racer, decent (but not always the best) at both of the above, someone who can keep a cool head and see the bigger picture to win a race staying strong for the long haul.
I am a decent time trialer, a decent racer and not a very good improvisational driver. Hard to tell how good at time trial i am as being good at it is as much about spending time and analysing as it is natural driving. On iRacing i spent a lot of time at Lime Rock and i had a very strong understanding of the circuit, to the point where i was within 0.3s of the fastest time, but that was a result of many many laps of practice, time trial and racing.