Not to invade hicaffa, but the diode is already there. Occasionally they go bad and only a limited amount of people have this problem.
I own an '03 (since new), and to this date the only problem I've had is the clock problem, which has probably already been replaced if yours had the problem. Never had the diode problem, the driveline bump, or the expansion tank problem.
Some people have a problem with the brake rotors warping and headlights blowing. Again, not myself. Not to say there isn't a problem, but not everyone has them. If my Sorento was totalled tomorrow, I would buy another one.