My thoughts exactly, for the claimed rated output power it makes me wonder. Having a very under rated G-8000 this doesn't seem to go along with Sansui's usual rating, but what do I know.
Looking at the different settings it seems like it could be used as a primitive surround system, it has
Hall, Surround settings a powered sub and it could be used, not to say it would compete with a real 5.1 but it would make a nice large chunk sitting in a room to say "well, bigger must be better"

, this thing is huge.
Jim