Physics engine as absolutely terrible. Racing cars are not even used in the campaign, the levelling system is broken because by the time you've levelled the car up enough to buy components, you no longer need that car for the events. This was supposed to be a ground up rebuild of forza but it just feels like a copy and paste of the last motorsport in sooo many ways. Apparently it runs nice on xbox however it runs like absolute garbage on pc. Possibly the worst optimisation of a game I've ever seen, no matter how high end your pc is, it can't run this game properly. Unfortunately it doesn't seem like some of these issues can be fixed in updates but time will tell. Such a shame.