new player, what classes are lacking on this server?

[Hollywood]

Despite the mages, particularly Necromancer being 'solo' classes; they aren't easy by any means. Just acquiring a significant amount of bone chips can be a hassle early on. And when you want to group, they get looked down upon by the average players.

They only become really worthwhile later on when you are able to solo significantly above your level and in hostile areas.

Contrary to popular belief, melee have a much better experience gain rate because of their ability to play in and out of groups.
It also comes down to gear. A Rogue or Ranger with nice equipment can do very well for themselves.

If I could spend time leveling something it would be Paladin or Ranger.