Oh, I completely agree. My point is just that it's very hard to get right. The AI has to feel consistently weak, rather than being blatantly smarter than you with deliberate slip-ups. People are remarkably good at spotting patterns!

It also depends a lot on the game--driving games are by far the worst, where you can tell the other cars are deliberately driving slower (and not just taking the corners badly) to give you a chance. Arrrgh I hates it!