Besides the raw luck of your spawn point and world generation, as well… For the purposes of showing off a difficulty rating number would be awesome, but even then results (luck) may vary. Could make a [VANILLA] tag on the main screen to show on screenshots that nothing has been altered from the generic settings… Granted, tricky folks could just photoshop their own tag in, but that’s your own deal 
The masochists among us need a way to represent the hell they lived through, though, and memorial files and screenshots can always be edited by the dishonest (though I love the addition of the memorials, definitely something to have). Could do old-school POINTS!, where certain settings have multipliers and in-game actions/achievements award points… I’m catching the irony just now of someone named deadmerits talking about honor systems
(no offense intended at all, just awesome)
In my opinion a game is balanced when you can adjust it to greatly alter the difficulty (both up and down), at least by designing a fragile character (and that’s been doable for a long while now). Not all gamers are as talented as the next, so weaker settings make any game more E for everyone. Its only bad when you crank it to the absolute max and give yourself every available handicap and still have an easy time…
Most gamers plot and plan (or read guides) and stack the deck in their favor in every possible way, sometimes right down to fractions of increases and this basically makes the game too weak (especially these newer console games)… But yeah, you can set up literally thousands of challenging modes/rulesets of the same base game, and this ends up creating an all-time classic that’ll still have a fanbase in hundreds of years after we’re all dead and gone. Any additional focus on experience alteration will only benefit it more. Is there anyone that plays cata that doesn’t open the options to alter at least one thing before starting?? 