WM/Expectations for adventure design

The GM's assumption is that Dungeon Fantasy is a slightly adversarial game. He's built dungeons and random encounters that are intended to kill the delvers; the delvers are trying to break the encounters. The odds should favor the delvers, but sloppy or careless play will get people killed, maimed, or otherwise rendered useless.
Do not expect to be able to kick down a doors, surprise a handful of goblins, slaughter them without mercy, and then move on to the next room where there's another bunch of unprepared goblins. Expect to be ambushed, to be outflanked, to be surprised, to be attacked on unfavorable circumstances, and to have to deal with enemy reinforcements. Some victories are going to be won with several members of the group unconscious, maimed, or dead. Some encounters may not be winnable, and the group may need to retreat and come back later with different resources and a better plan.
Everyone rolls their dice in the open. There are plenty of ways to get rerolls, from spending CPs to Luck to various magic spells. However, if you've used up those resources and a bad roll still gets to you, don't expect the GM to intervene.