The one thing that I was worried about, turned out to be the big problem with the game. The AI. I mean, it's probably the best racing AI I've ever come across, it never gives up and doesn't have a problem with being aggressive. However, it's just ridiculously slow on certain tracks. I was by far the fastest in Bahrain with a Virgin Racing car. Change that to a McLaren or Red Bull, and I'm another 2-3 seconds faster.
A shame, really. Otherwise the game is excellent. The physics are solid, the handling is really good, I like the graphical style... Just need another two or three difficulty levels to get the AI going as well!