Hmm a few thoughts.
The +5 damage. Against a Solo with say 200 points and you're dealing an average of 20 points of damage a round, it'll reduce the number of hits required by from 10 to 9 or 10% faster.
What level are you looking at, doing 20 points of damage on average is a LOT in 4e!! My 5th level two handed all strength fighter does 13 on my at-wills, and will just get 20 on my best encounter power.