DC has amazing gameplay, it's one of the most fun racing games out there. Forza also isn't ultra realistic, it's around the same level of simcade as GT, which is why it can have good graphics. Pcars fits the description "ultra realistic physics with unrealistic graphics" a lot better. Consoles are far from capable of both. You can have realistic physics with average graphics (Pcars) a good mix of the two (GT, Forza), or photorealistic graphics with less complex physics (Driveclub). To me, personally, I like that not all racing games are going for the same niche. Driveclub co-exists perfectly in my collection with Pcars, I play them both for different reasons. 👍
Forza's not directly competing with DC's visuals, or Pcars' physics, as it's targeting the exact same audience as GT. If GT7 comes out and is still the same underwhelming bollocks that the last two were, then Forza 6 will have achieved it's goal. Pcars will be against AC on console, DC vs NFS, and FM VS GT. I'm loving the competition!
She knows absolutely nothing about cars though, so I could tell her it needs a new exhaust