What does this have to do with DPS dying in the fire? Bad tanks are bad tanks be they DK Palladin or some hunters pet.

However there are reasons people do die in a fire. First is latency and frame rates due to a computer that is old and tired. Sometimes all it takes is to work on the graphics settins. No the game is not a pretty but the results are worth it. For others, only a more powerful computer will do.

Another reason is that people simply either have not read about the fights or simply forgot. Let's face it, with all the heroics and raids if you have been playing for some time it can be tough to keep it all straight in your head. Don't depend on memory. Use the resources out there to quick scan what is gonna hurt your class.

Warriors, for crying out loud pull back on your camera. Ah...you don't know how to? ASK SOMEONE. When you can only see yourself and the back of the bosses calf bad things are going to happen. Ranged DPS have an advantage that they have a great view of the action by doing nothing else but standing there. You do not. Pan around once in a while. You do know how to do that with the camera rather than move your toon

Despite the fancy armor most bosses can still crush you like a bug. In Wrath till you became overgeared the tank survived from cooldown to cooldown. Now, the healers are watching out for him, why the heck do you think they have time for you? My suggestion is if you only tank on your warrior, run some heroics as DPS. See how the other half lives.
If you only like to dps, then find some friends and offer to tank some heroics. It is an eye opener.