If some class is " useless " its not because of bad players, its because of game mechanics. Take a typical party.

1. healer = first choice = cleric, second = fvs , mostly ppl don't even flag third 1 = bard??
So for healer spot you have really 2 choices (3 but rarely )
2. CC = first choice wizzy , second = sorc . 3. = bard
So for CC role there is only 1 class and that's wizzy, 2 and 3 are if u cant get wizzy (only In VON6 u really need fascinate)
3. buffs = 1. bards (songs + buffs ) , 2 = wizzy/sorc and cleric/fvs but they are covered in spots 1 and 2 , 3. rangers

Spot 4.5.6. DPS - 1. barbs-fighters and multyclasses of them . 2. pallys 3.rogues , rangers 4. monks

So many ppl in my experience thinking like this.