Its funny how AC and rF did the exact opposite.
rF: Great physics, no gfx (dx9)
AC: Beautiful, but no physics.
IMO, the biggest thing rF2 lacks is content.
And the biggest thing AC lacks is a tyre model.
Personally, Ive been impressed with SMS since NFS Shift. I honestly bought rF2
because of the tyre model. If iRacing didnt require you to be a millionaire to enjoy more than 2 cars and 3 tracks I would probably own that too.
Everyone's complaint about PCars seems to be ffb... I wonder how many actually tried to configure their own... Sure its inconvenient, and a lot of guesswork until it felt right, and going from GT to OW required some adjustments, but it was miles ahead of AC(again, my opinion)
Lets not forget that PCars was advertised as a "By racers, for racers" simulator. Forza and Gran Turismo are nice and all, but if you can navigate a clean and decently quick lap with a controller/gamepad, its not a true sim(people also complained they sucked at PCars with xbox/ps controllers, I did too

). If you dont even have a tyre model at all(AC), this day and age, not really much of a simulator to me either.
And DX11? Performance increase? Not yet... Ive yet to read of someone with better FPS at the same settings, even with plugins/post-processing/v-sync all disabled. Looks pretty for sure, but it doesnt make me any faster.

If anything DX11 is a downgrade, on account of the loss of real time telemetry from plugins like TrackMap(single display & no tablet for the "workaround"). However, if this is a part of the new UI, I would actually consider it(dx11) as positive progress. Although, DX11/VR = more sales, more sales = more $ for development of content.
Long story short, you can never please everyone.
As far as Pcars 2 is considered, SMS is putting a
massive effort into it, and I will be surprised if it is anything short of enjoyable.
Cheers,
rocket