Mentor Roulette is not a Roulette to help new people... it's just a filler roulette for more or less every damn duty in DF available.
It dosn't include an algorithm for filtering dungeons so you get into one with a new guy. It just places you into the next fitting queue for any dungeon.

Mentor Roulette like it is now shouldn't be locked behind the mentor status just locked behind every duty completion and maybe just a little raised rewards.