In the United States, more flights go through Atlanta than anywhere. It's been said that on the way to heaven, worthy souls still would have to connect through Atlanta. The same can be said of Kuala Lumpur. Too many of my passport pages have been used transiting on AirAsia flights through KL.
I've said my fair share of negatives regarding 737 business class (see Ethiopian Business JNB-ADD: The Worst Flight Experience). My flight from Sydney to Darwin was on a 737 but my take on the flight is only positive.