Gotta disagree with that statement. 
I would agree that it is not buggy, but it is very user unfriendly. Once you learn the "tricks" then its not too bad, but there is no way to really just pick it up and create.
-The mini map does not update for land changes.
-Understanding all the codes to insert the right item as there is no descriptors (just a string of text saying "Large Air Field" or something to that effect would help greatly on the learning curve.
-No way to zoom out long range. Creating the terrain feels claustrophobic.
-Better navigation. Mouse pan,zoom & angel would make using the creator far easier.
-The brush sizes are no were big enough.