I wouldn't discount everything that's said by someone because of their guild tag...
Though, you should consider taking what those members say with a grain of salt.
Necros - ... they bleed utillity. FD, Res, Mez, (self)-Heal.
Necros, also, have a 50% slow to undead, a group mana recourse, a poison/disease debuff Shaman seem to like in groups, and a poison resist/eb/lev buff.
They are the only one of the 4 casters that will ever, EVER, do well in an on tier 6 man zone.
Because of thier toolset, necros are always useful when a group's dps is low. Once that group's dps increases, necros are less necessary.
They have end all dps if they use the festering curse AA.
FC is only worth casting if the boss has high hp, doesn't pop in and out like a jack-in-the-box, or self-dispell. If these conditions are meet, it is significant dps. I do more dps on a low health boss without it.
Even with out this they do not suffer from the wizards problem with resists as there dots often have high neg resist mods on them. For some reason the necro archaic has 10times (neg200) the resist check of the wizard and Mage archaics, bringing it up to par with lurs in terms of resist. This will almost always land.
1. Claws of the chill lands like crap in most of pofrost, and parts of thaz and pofire. The fire spells land like crap in fire zones. The poison and disease dots are a bitch to land everywhere. This is why its called a dot rotation.
2. Many necro dots have high negative resists because there is a significant difference between class mechanics.
a. Being built around crit dice rolls, a wizard has the ability to do in one shot the damage a necro can do in 6 ticks to 12 ticks. Mage's get three shots at it, but they could use a class review.
b. Necro time to max damage can be as long as 6 to 7 ticks, depending on rotation.
c. Necros have a binary resist mechanic. No partials
d. Necro dps is extremely stable and consistent within the constraints of resist and rotation.
e. Outside of soloing and raid bosses, necro actual mana efficiency is generally terrible.
... as their dps is "hidden" most of the time.
Not any more. Though it is unnecessary. Given a rotation's base damage and the caster's crit %, a RL should be able to work out a necro's dps prior to a fight.