The Case For or Against Cross-World Dungeons

[Sorel]

You can make a party and walk into an instance and be transported to that place or go to the dungeon finder and everyone within that party will be transported to the same place.

Is that how current dungeon finders work in MMOs? If me and my friend decide to take on a high level dungeon we can just walk in, no questions asked, and complete the content?

No sarcasm, I'm asking an honest question.