Speaking for myself here.
In the case of Forza, absolutely! I left GT6 for FM6 2 years ago because the grass looked greener on the other side and PD was nowhere near a new GT title for the new console. FH2 was actually my first Forza game and it was awesome, I liked FM6 as well and enjoyed FH3 a lot. But the underlying tone of these games is that all Forza's feel pretty much the same. I got FM7 as well and bam, that tone hit me hard since I was already bored with it after the early access weekend, go figure. Friction assist, rewind buttons, a silly ragdoll making idiotic movements in front of my car, loot crates, some cheap sounding rock music in menus, .... it is very obvious the last 2 years Turn 10 has been focusing on making their game appeal to the kids while at the same time pleasing Microsoft to deliver a 4k HDR tech demo for the XBox 1 X, instead of improving their core gameplay.
GT:S has on paper always been the weakest of the 3 big racing games for me. Poor track roster, poor car sound, no dynamic time of day or weather, no classic cars, so many features cut from GT6. I was not even remotely close to interested in it. Well, this past week was absolutely amazing, I even doubted if I should get the GT:S demo or not but since I recently switched to unlimited broadband I thought: why not. Coming back to the GT:S demo was a real eye-opener. But it took me 3 days, the demo really grew on me. First day I was impressed but didn't plan to buy the game yet, second day I didn't even play since I was watching some more Super GT races on NISMO TV, third day I played again and I believe the 4th day I even pre-ordered the digital deluxe edition.
The contrast of the mature feeling of GT:Sport with the kiddie feeling of FM7 couldn't be any bigger IMO. I absolutely love the calm and peaceful menu music, the scapes are absolutely great, I love the overall presentation and the brand museums + brand videos are like a nice interactive car encyclopedia. the campaign things like driving school feel so properly implemented (in contrast to Forza's overly annoying autocross or car bowling), I'm actually happy to win a single car from completing a row of missions in GT:Sport while in FM7 I don't even care about the 600+ cars I unlocked because some cars I already had in up to 4 previous Forza games. Back to GT:S it has the best singleplayer time-trial boards where per track i can compare all my own times with different cars and compare the cars that way. And GT:Sport does bring back some nostalgia like the cursor movement with the D-pad, those familiar menu click sounds and things like that, really nice.

But the racing itself and the car engine sounds.... I'm still not really sold on that and that brings me to the next point.
PCARS 2 is for me the best racing game/sim I played so far, I absolutely love everything about it. No way GT:Sport will ever replace that authentic racing feeling I get from PCARS 2, it might be great fun as a game though but in the realism for a driving sim, it's not even close. But it doesn't have to be, GT:Sport complements PCARS 2 just perfectly. They are both the big winners for me personally of the big fall releases while FM7 is the sore loser. But PCARS 2 is a complicated game made by a small studio on a much smaller budget of what the big boys at Microsoft and Sony have. So there have been quite a lot of bugs, the first major patch is out and it fixes a lot, but there is still a lot left to fix and improve (which I'm sure will be done over time). With PCARS 2 I have this feeling that I better wait a bit before I fully immerse myself into career mode so I decided to wait with that until I have my XBox 1 X (and a few more patches are released for the game). In the mean time I played some Forza but since it's so boring I've put that on the side as well until I have the X1X, in the hope the 4K HDR will rejuvenate it a bit for me. So the GT:S launch comes at a good time.

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