Now, allow me to disagree. To me, in racing, you actually need to change your tires to rain compound when it starts to rain. And back it to dry, once the rain is done. That has a big role on a racing matter. And anyone who actually played on a competition level above offline races against AI knows that. Specially on games that have dynamic weather.
Second, a game today is more than just racing, if you only cared about racing, why are you playing Forza at all? If racing is the only thing that matters for you in a racing game, i'd suggest to get iRacing, rFactor or Assetto Corsa.
Third, there are countless negative reviews about this game, also a lot of complains about it's own fanbase, which Turn 10 themselves recognized it.
And forth, there are countless reviews about the game, which i have watched, if you really think that playing the game would completelly change what someone thinks about a game, you're completelly wrong. I had an opinion about Forza 6 before play it, and it remained the same after i played it. (Actually, it got worse for Forza 6 after i played it, but that's other subject)
But, again, to focus the argument back to it's topic, this thread is not about Forza being a bad game, it's about it being worse than Forza 6. Many problems that Forza 7 do have, which you don't need to look much deep to find, were unexistent in Forza 6. If you could name, exactly where Forza 7 is better than Forza 6, please do so. Other than having dynamic weather, i can't see where it is.
Edit: And on a more personal level about the bugs. The bugs themselves are not what the major problem, the major problem is the lack of care. Those mistakes shown in the videos are simple things, that could be easily fixed in less than 5 minutes, and yet they seem to not care at all. And i think that's really wrong thing to do, if you're a developer as huge as Turn 10.