Overall I can't really agree with you. I have plenty of problems with Forza 5,6,7 albeit clearly my memory isn't the best. However I do remember greatly disliking them compared to the Xbox 360 titles. I hope that they have the same level of care, design, and content as Forza 3 or 4 with 8. I had the same problem with Gran Turismo during its PS3 years. I *really* didn't care for 5 or 6 and felt they were massive downgrades to 3 and 4 on PS2.
Horizon is really the series that "saved" the franchise for me, at least until this most recent release. Not a fan of Horizon 5 at all, and I was already getting tired with 4.
But given how Turn10 is taking its time with Motorsport 8, I am very hopeful. Anyways, this is a bit offtopic.