im a level 122 night lord with just under 5k range is that bad[/quote]
I've seen level 110-120 Hermits that hit 6k per star on TT at LHC. (Those extremely unfunded 3rd jobbers at LHC- especially Hermits, are the ones that are the most annoying and spams "JPQ@@" even after you tell them it's not a PQ and your party is full.)
I think the bigger problem for Thieves is not damage, but HP.
When you take a long time to kill zak, the flying monsters can get pretty thick. I can't speak for other Thieves, but NLs don't have an FMA (like Demon Cry for example). As a result, it is difficult for us to manage these flying monsters. Get hit by a bunch of them and a few falling rocks in rapid succession and you will die if you don't have sufficient HP.