I quite agree with Max Angle, no matter what the books say--it is your A** that will come in contact with terrain. The controller maybe the subject of the BOI, but you will only be fondly remembered.
Always, always, be familiar with the local terrain BEFORE accepting any directs at low altitude. The MORA altitude at a minimum, if published. Fly in South America once in awhile and you will be amazed at the clearances given, many controllers there still believe it is their job to separate you from other planes, the operation of your plane is your business, including terrain.
GF