DPS meters and why they're necessary

[Exstal]

It's already been said a lot.

Scenario A) DPS isn't up to snuff, no one knows who is unable to pull their weight. Entire party disbands (I had that happen in Titan HM on my alt).
Scenario B) A sole DPS is not pulling the right numbers. Leader says, "back out". Kicks the weak DPS without letting him know.
Scenario C) A sole DPS is not pulling the right numbers. Leader says, "Yo, DPS B, can you pull your DPS up, you're doing pretty poorly." Either DPS B does so, or it happens to go to scenario B.

I had scenario C in my raid group but the raid leader let DPS B stay for 3 more weeks in hopes that he would bring his DPS up. He didn't, so we kicked him from the static. If you're going drag your raid team down, and then after being confronted on it, still don't change your ways, you're a detriment to the group.