What DW weapons are you comparing the Reaver too?
A 2h will have a tendency to hit lows and highs but in general you will put out more damage over time. Your ripostes will be larger. This just gets more obvious at 60 especially with triple attack on a warrior or monk.
Here is the chart we are using on blue:
https://lucy.allakhazam.com/dmgbonus.html
For what it's worth I havent seen a warrior with a DW dps setup outperforming a 2h setup of similar quality. You could download gameparse and check fight by fight and see how your own setup is going. It's not just for forum bragging...having this data to reflect on is really handy.