I was watching one of the "first 15 minutes" videos and noticed that the stupid "WTF is a brake petal?" AI has returned to FM4. Now, I've seen this type of AI before, but the only problem is, other than Forza 3 and 4, the only games I've seen it in are arcade sims and kart racers. Mario kart has the "perfect when behind you, stupid when ahead" AI to make it seem challenging...but...it just doesn't seem right in a "serious" racing sim...Not that Forza takes itself too seriously obviously, but still...I like GT5's AI better...at least they don't forget about the brake pedal.
Later in the game it happens very rarely, FM's AI shouldn't even be compared to GT5's , it is just another level. AI racers do nothing in GT5 at all, just robots doing their job perfectly.