Which class when played with skill affects your group the most?

[Gumbo]

I've noticed this problem and maybe it's just the Bards that I have been in a group with but they will start with playing songs and buffing/healing people. But within five minutes, they just want to be a tank and jump into combat and stop playing songs. Then they complain when people complain about not having haste or any buffs.

[skarlorn]

Yesterday I was camping guk spiders, just about to break the giant spider, and a red con bard ran in and sniped it. Not technically illegal I guess, but fuck bards