Compare to a brutal rogue with 20 dex, 16 str, and a rapier
+8[1 higher than the ranger] vs Reflex[def on average 2-3 lower than AC]
Dmg of 1d8+5+3+2d6 = 19.5 avg
Hits Ref of 13(2 lower than target AC from ranger) on a 5 or higher, a 80% hit rate.
So avg dmg is 16.025
Backstabber+dagger is...