I know it's called LEVELING roulette. That's why I'm running it, because I do in fact happen to be LEVELING.
It wouldn't be nearly as bad if the exp scaling from lower level dungeons wasn't so horrid. Most of the time it doesn't even dent the bar, save for the bonus at the end of it. I run it because I hope for that lottery-esq instance where it drops me into something relevant to my own level (which is awesome, it's basically 1.5+ dungeons' worth of EXP).