Necromancer is a role play character, nothing more.
That, and if you get to about 26k-28k you're good dps. More can probably be achieved, but not required. Just please make the effort to get to at least 20k dps, groups can be rather painfully slow if there's less dps.20k is more than enough for most content in this game. Don't let them tell you that you need 50k for a raid.