Bad players in dungeon finder
If you run pick up groups then it's inevitable that, in the course of playing World of Warcraft, you'll eventually run into a player who is less skilled or knowledgeable than yourself. Obviously, there are a lot of ways to deal with that situation, ranging from the cruel to the kind.
My personal approach runs toward the kind end of the spectrum, because I think that my World of Warcraft experience is improved when everyone I'm in a group with is having fun. I also believe that by volunteering information, I improve my potential future pick up groups too. It's sort of a pay-it-forward, be-the-change-you-want-to-see kind of thing... There's an added benefit in that my vote kick also gets saved for players who truly deserve it, such as those who are genuinely rude, or who are simply griefing.
The vast majority of the dungeons I've been in have run smoothly. In those situations where I can see that a player is struggling though, I take the initiative and explain the fight, including their specific role. I whisper them and let them know they can ask me questions, and I won't blow up on them. If they aren't performing to a level where beating a fight is possible, I've even let players know that we need to replace them, as well as why. I've actually had players bow out in those situations where they weren't able to perform. Most of the time, the player who was struggling was just a little confused, and steps up and makes it work. Personally, I find those runs much more fun and gratifying than a simple speed run full of over-geared players. There could be something wrong with me.
Anyway, I digress. My bottom line is that it's amazing what you can accomplish just by treating others with a little dignity.
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I laugh at the snake oil they're selling with this. How about the runs where a hour instance turns into hours? How about those pvp geared healers and tanks that don't have the avoidance or regen to properly heal new 5 mans? How about when you offer that advice and people get mad and go off about it? Blizz is only showing one side of this.