I actually like The Simple Truth but I don't feel that it makes a good introduction to the Sequences.
Same here, though I think it does depend on the readers background. People who strongly disbelieve in the concept of objective truth might find it helpful to have that taken care of before starting the sequences proper, but even then I'm not sure if the simple truth is the best way.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.