Dungeon Difficulty Indicators

That, I think, is what they're trying to do at the moment. As the gear you have at any point is random and we know you can pick up powerful items from different places there isn't such a thing as an "average party".

The responses to the Trog and Prison threads show that some parties have walked through them and others have battered their heads against brick walls in trying to complete them - I include myself in the latter category.