I have to say, at the moment pCars is a solid racing game. I'm enjoying it, but feel like the content is slightly lacking, and also I seem to be getting occasional glitches, such as the steering locking in one direction. From what I've experienced, I actually prefer it to Forza 5, but I'm looking forward to compare it to Forza 6 later in the year.
Forgot to say - I'm playing on an Xbox One as my current PC can't handle it.