I don't mind if people don't play well in dungeons. In fact I look forward to it. I love seeing them get killed by mechanics and learn from it and like that sometimes a tank challenges me with things like lack of tank stance or lack of mitigation. Skill level variety is about the only variety we get in dungeons, so I'll take it.

I wouldn't mind if dungeons were like this though:
  • Lack of mitigation = death to tank busters or autos
  • Lack of reprisal or other party mit means a party wipe to raid-wides
But right now you don't really need to care.