There are things wrong with all different type of cars. Whether they are American, Japanese, Italian, German, Swedish, whatever. Some things I can point out in the American category are, one, the GM Quad 4 motor, two, the early Ford 2.3L, and the GM LS1 motors' tendency to spin bearings.
Japanese cars arent without their faults either. Most Mitsubishi 2.0L DOHC engines they put in the Eclipses and Talons wont live past 120K without blowing a head gasket or overheating for some reason or another.
You can always find something wrong with any car. I, for one, prefer some American cars to Japanese, and some Japanese to American. It doesnt really matter to me. I just look at it as a love for cars and thats that.