Oh boy, why is so hard for certain people to accept that using DF is like a dice roll and all you can do is deal with it? From my experience (EU) extremely bad parties are rare, yeah at times a dungeon take like an extra 5/10 minutes but thats about it. If you don't want to deal with this stop using DF and form a premade, no excuses, for a dungeon you only need three more players. If you don't have enough contacts make more and if you can't improve your social skills.

Also, you should accept that some people are just not that good even when they are traying their best, thats why basic content is so easy.