There is a severe balance issue between DPS and stat-damage weapons. The character builds, classes, and other factors are a distraction from that issue. If you were to give any melee character dual puncturing weapons, regardless of their build, then have the rest of the party use DPS, the character with the puncturing weapons would likely have more kills than anyone else.(In high-end content, of course) All you really need is a keen puncturing weapon(Or Imp. Crit). If one type of weapon is that much more powerful regardless of who is wielding it, then there is a problem.
I am personally in favor of adjusting the HP of the mobs down to a reasonable number so that DPS is a viable alternative. Stat damaging weapons/builds would still be just as effective, but it would make other forms of attack effective as well. There's just something wrong when my THF-specced barbarian is better off wielding dual keen daggers of puncturing than a MinII greataxe, but that's what I have to do in many quests if I don't want to sit there beating on things forever.