A really good burger needs good bread. Standard supermarket hamburger rolls don't cut it.
I make my own. They're nothing special--just standard white bread dough cooked up as rolls--but the freshness makes all the difference. It takes the burger out of the wax paper wrapping and brings it to the level of a good home-cooked meal.
But the rolls should not be so crusty that they crack when you bite them and stab the roof of your mouth. Leave those egg washes in their shells. Food should not be a masochistic ordeal.
If you don't have the time, bakery rolls will do just fine if they were made that morning.
Anyway, it's not a good burger if it doesn't have good bread.