My biggest problem by far with Forza 5 is the erratic drivatars, I’m praying T10 dump them in F6, and for the record playing offline does not improve them they just won’t update anymore until you reconnect to the net.
It is possible to make great AI, Codemasters AI in F1 2013 is an excellent example, the best AI I’ve ever competed against, perhaps the T-10 could take a lesson from them.