A poster on another forum notes that air traffic control kept Asiana 214 higher than the same flight from Seoul that landed the day before, requiring the aircraft to make a steeper descent to the runway.  This is sometimes called a "slam dunk" approach.

The top illustration is the descent profile for the accident flight.  The bottom is the profile from the Asiana flight that landed safely the day before.

Asiana 214 Slam DunkAsiana 214 Normal Approach