The traps there are very numerous and have extremely high DC even for specialized high level rogues. Rather than making the quest challenging and requiring a good rogue, it results in extreme frustration that detracts from the enjoyment of playing through the quest. From the few chats that went about it, this seems to be universal opinion and indeed the quest is being done very rarely. The other option could be improving the rewards / loot, but I understand that was already nerfed.
I've done this twice with different rogues that were level 9 who had troubles consistently spotting traps. Both times we ended up abandoning the quest. The traps all have quite high DCs and are typically located in long, narrow corridors where mobs spawns. NWN doesn't really handle careful movement in combat very well. I would be a strong advocate for removing traps from encounter areas as this is one of the major and most griped about design flaws of Vera.