Forza drifts for you and at impossible angles not to say it isn't fun but it isn't as realistic as GT5, I put over 100 hours into Forza I know my way around it pretty well.
The AI in forza aren't as "stupid" but they're made easy to beat just like the whole game is, try driving the same car as an AI and you will some how be faster on the straights even when not drafting