my 2 pennies on airasia
Used'em BKK-SIN. The boarding gate differed from where the plane was parked -by a long shot! By the time we all boarded buses to shuttle out to the plane, our departure time had long passed.
However, I agree with the other posters that the flight crew was friendly. No frills airline, but they do offer cheap snacks.
The BKK-SIN fare was US $60 rt which was great at the time.