I see a translation problem in there, which is causing some wrong expactations. In german it's called "Roulette: Niedrige Stufe", in english would this mean "low level roulette" and this fits. You go into a low level dungeons, a random low level dungeon cause it's a roulette. And "leveling roulette" fits perfect, cause you go into a random dungeon in the leveling phase. I don't know why all people are crying about, they can't really use the leveling roulette for leveling, it's not for your leveling progress, it's for the leveling progress of others you can help with lowering que times. You get a bonus as compensation for not getting a dungeon on your level and if you hit this be thankful for a bonus to your normal dungeon experiance.