I don't do high(unless pre-made)/levelling roulette's for pretty much reasons said, I agree if you don't have patience don't do roulette's. I do expert, trial and main scenario as its all easy even with bad players. Unless you get steps of faith or chrysalis but usually someone will always bail after a couple wipes so I wait it out.

I always explain, I always help but when people don't want to listen OR listen but can't dodge the simplest of mechanics I can't wave a magic wand and make them better to get through the dungeon. Vote abandon failed, so I leave and take a 30 min penalty. Plus I find high roulette a waste of time - around 470k exp for an aery run - around 200-300k for a high roulette which is guaranteed to have new people who might be really bad which makes the dungeon really slow.