Never base your decisions on people complaining on forums, it's the vocal minority most of the time, this is the best open world cars game to ever land on the pc, I'm playing it without any issues, sure the performance could be better but hopefully they can get that sorted out.
Please, go to the forza reddit and windows store forums and literally look at the thousands of complaints about the games performance, crashing, and update problems. My friend was unable to play for a week because the store would not allow him to update.
Please realize that you are in the minority having absoulely no problems with the title. Your claims are annecdotal and while so are ours, at least theres thousands of other players out there sharing our issues and complaints.
Also, not a single poster here has said they've let these issues hinder their liking of the game. Its still great but theres no need pretend like our claims are fabricated or over blown. We're pretty reasonable compared to some posters who come to these threads only to bash game devs along with jabs aimed at their rival GPU camps. Many come to spew but many also don't play or buy the games they bash.