Let me start by saying the only motion-controlled racing games to have critical sales success and good overall reception have been kart games. While a variety of other racing games have supported motion controls -- I don't think any really ever caught on. Kind of shame as it's the genre that probably holds the most promise for motion controls.

The fact that Slightly Mad cancelled the PS360 version but not the WiiU version is intriguing.

I don't think they're fully going just for the traditional racer with traditional controls. This also being a PC release means there's probably racing wheel support. While full racing wheels are interesting, they're expensive and often collect dust -- especially  when made for consoles. However, I think Slightly Mad could be going for the same experience on consoles with motion controls.

By the time it releases, Mario Kart will have been out in full force for several months -- meaning you have many folks who have recent experience with racing motion controls.

But hold on, the PS4's Dualshock 4 also supports motion controls. Though I don't know if that feature is confirmed in CAR's PS4. But let's assume it is. Bring in the Morpheus VR crowd in and you have yet another segment open to motion control scheme.

I think between the GamePad, Wii-wheel, and the DS4 you some pretty good motion control options. They're considered mainstream enough to build features around but are yet so underutilized that it could critically differentiate Project Cars from other console racing games.

The only racing game in recent memory that tried motion controls: Need for Speed Most Wanted U -- which sadly failed in sales. Over the last few days, I've grown accustomed to the Gamepad motion controls of NFSMWU and I can tell you that it delivers a pretty immersive racing experience. While it feels imprecise at first -- you grow to be more aware of how you're holding the controller and begins to feel much more like you're at the wheel. IMO If it were more timely ported and better marketed at the time of the WiiU launch it would have done far, far better in sales...

Are there other motion-controlled racing sims I missed?  If you know of them, I'd like to hear about your experience.

 TLDR I think Project Cars offers a good chance of being the best motion-controlled racing sim ever made. And you?

I'm picking it up on the Wii U. This genre is usually lacking on Nintendo platforms.  Not that interested in motion controls (hardly used it in MK) but I would give it a try perhaps.  More than likely I will just stick to reg controls.

Reading the thread title, Forza 4 has that title.

Why would you use motion controls in a sim racer?

Anyways they sold me on the game when they announced Morpheus support, that's the thing I'm most interested about.

I think the XB1 controller is capable of motion controls. it has these lights on it that Kinect can see--almost like the Eyetoy and Move working together.

Why would anyone use motion controls on a racing sim?
I understand that not everyone can afford a wheel, but everyone has the next best thing which are analogue sticks.
maybe motion controls is fun for a while, but anyone serious about sim racing will go for more accurate input.

No, because Real Racing 3 has already nailed motion controls. The game has a lot of other issues, and isn't simulator enough for some, but the controls feel more right than any other racing game I've played.

I'll be very disappointed if Cars can't produce a similar experience on Wii U.

In my experience once you 'get' it, it's actually pretty fun. I'm having a blast with NFSMWU's gamepad motion controls.

Surprisingly, after about 2-3 hours of using gamepad's motion controls I've found motion control to be equally as precise if not more precise than the analog stick -- at least in the case of this game. It makes the driving experience feel more genuine.

Never really 'got' driving sims but I'm definitely looking forward to giving the genre another chance with Project Cars. Especially now I can drive IRL it may appeal more, might even go manual instead of automatic...

The general iffy-ness of Kinect's precision performance make me think otherwise...

but I haven't played Forza 4 so what do I know.

What Kinect gameplay would lack is some of the tactile feeling of steering the vehicle