Ok, so Mentor Roulette contains extreme primals.
Was including those in a roulette not specifically made for them really such a bright idea? Earlier an FC buddy asked us to jump into an in-progress Shiva EX group, so we did thinking it was an attempt for a pony. We queue in and he tells us it's for his Mentor Roulette. Wipe after wipe after wipe, mechanics fully explained more times than I can count with people still dying to the same thing over and over. In the end the timer ran out without us ever getting under 50%. And this was Shiva, probably the easiest of the EX Primals. I mean I know SE wants the veterans to help the newbies, but come on, there's a limit to how much you can stuff into a roulette. It's Duty Finder for pete's sake.
There goes my desire for those Expeditioner's Flyers, I can't imagine doing this 200 times.
inb4; "don't be a mentor if you aren't willing to help"
-I'm not a mentor, I forfeited my mentorship the first week it came out. Stuff like this is why, I don't have the patience for it, and I'm not ashamed to admit that.