It's all about attitude. Too many that are coming out of there have this stupid and unfounded belief that they are some sort of superpilot because they have a little time in a CRJ sim.
There's no way you can digest enough in that short of a time or for that matter, see enough different situations to be a safe pilot. Remember, the PTS only sets forth the MINIMUM standards required to obtain a rating. That's exactly what you're going to learn in that short amount of time.