The auto correct works exactly the opposite of how I would expect it to work. The thing is, if I ever got used to it I'm certain it would be more efficient the way it is, since the usual answer is to accept the suggest word. Unfortunately, I can never remember to hit the x when I don't want the word.

One thing that saves me is if you DO accept the word by mistake, and then go back and re-type it, it is smart enough not to try and guess for you again (or at least, not offer the same suggestion).