Seriously... I go to report in that I have finished a mission for him he immediately says "Are we ready to take the castle?" and then after I have reported that I have helped a settlement he says the same... damned... thing...
"Blah blah blah... remember to help anyone that needs help blah blah blah."
Every time he repeats it I get closer and closer to Todd's suggestion of "Shoot him in the face if you want to!". Why they hell couldn't have Bethesda put a little more variety into his dialogue instead of the same thing fifty time as if the Last Survivor is a moron that forgets to help people if he isn't reminded at least ten times a day.
Would I use Preston as a companion... Well, rearange these words into a well known phrase or form - "Freezes", "When", "Hell", "Over".