Make a calculated decision off of your choice, your reasoning, your appeals, don't be sheeple. People who buy the game for the sake of the game, of the brand or make one sided views without weighing it all out, those aren't good consumers.
Just because I bought the Gran Turismo series of games doesn't mean I'm a fanatic who tramples all over Forza claims, in my mind Gran Turismo should take a cue from them in terms of AI, sound, and detailing.
Gran Turismo 6 is this, I've posted the same thing to many others who asked on buying it, GT6 is an investment.
Its an incomplete game that will mature with time. If you think about it, many who have played the launch day version and this current version of GT6 laud it as being many times greater than its predecessor or even the best game they ever played, and this is technically an incomplete game still. Quite an achievement.
I think you should buy GT6, I like it as of now, it has its flaws, nothing extremely major (besides the sound, but its gonna be patched

) and the physics engine is quite good compared to other games. If anything this game is 60$, but as of now, its worth 40$, GT5, when it came out cost 60$, but it was worth 20 or even 15$ due to so many issues and gripes. With updates, it filled out its value, and some. GT6 will probably be a 60$ offering with many many more in content as time goes on.