The reason The Augusta National looks bad in the summer is because it is closed during the summer -even to members.  It is open from mid-September to May.  (I may be off some, but that's approximately the times).  They drive bulldozers across the course reshaping greens and fairway mounds.    I was fortunate to be asked to play The Augusta National many years ago by a member.  I walked the course along with him.  My Dad and his friend rode a cart.  We all had caddies...