I mean one handed weapon + nothing else. No shield

In my opinion this is the perfect style for rogue backstabbers
W&S (warriors) = Tank
2H (warriors) = Dps
DW (warrios and rogues) = Dps
Single weapon = backstab burst and lower Dps after that

2 weapons can provide double bonus for attributes/talents/abilities, so 2H and 1H should have something good that compensate this.

1H without shield is perfect for a fast (+speed) and deadly backstabber (bonus damage on backstabs) while having lower dps after the initial burst