The way I see DPS (have used all dps up to at least lvl 15, but main melee dps) is your ranged DPS' are safer bets simply because they stay out of harms way. Would recommend ranged dps when you are new to a dungeon.. it can be tougher for Lancer n Pugilist classes simply because you are within aoe range of any mob, you can potentially aggro additional enemies due to positioning (which can, at times, be tanks fault) and its harder to be aware of map.

This isnt to say ranged DPS are the easier class (though i believe so, having played all dps and am biased having always played melee dps) this is to say there are percs to being ranged. Now as far as how good you are with said ranged dps, thats another story.

But as far as end game DPS, everything is rather useful. Just depends on preferences and situations