New Player Class Question

[Taryth]

You most likely wont do well as a soloing Rogue, unless you don't mind waiting LFG for most of the XP you'll ever get. But they're not overplayed and can deliver serious sustained DPS. Not to mention being able to picklocks and sneak to corpses (extremely valuable.)
Wizards aren't terribly crappy. They can be effective if played correctly, but a Wizard is certain to fall behind a Monk or Rogue, probably Mage, too, in DPS. However, I've never seen anyone say no to a Wizard if a spot is open in group . . .which can't be said for Druids.
Mages are OP (imo disclaimer), but an extremely fun class to play. They deliver excellent sustained DPS, can burst DPS fairly well, and are highly survivable. Their only downfall is a complete and utter lack of CC, aside from the much-maligned Earth pet.
The Shaman is incredibly versatile, although I have only limited personal experience with this class. Heals, buffs, root, DoTs, pet post-34, and personal mana regen that would make a Wizard jealous. If you like being versatile, I think the Shaman is one of the most flexible classes in EQ. They can even melee, granted decent gear.

I'm sure some people will disagree with this or that, but generally, that's about how those classes are on P99.