I won this weapon in a recent guild Emoush raid and I LOVE it!! The average DPS for me is about the same as the Blade of Disruption - and I am at level 67, so the ratio is 25/33 for me vs. 25/35 at level 70. I suspect the reason DPS is about equal is that this weapon is a bit faster, so you get more double attacks and crits in spite of it having a slightly lower ratio.
The item display doesn't explain this, but the runic effect also heals you for 80 hps. In solo fights lasting avg. of about 3.5 minutes the proc is occurring 6-10 times per fight. That's roughly 500-800 hp healing and around 600-1000 dmg absorption. The BoD does have +15 AC that this weapon does not have - but I really don't see much difference in the defensive damage I'm taking regardless of which weapon I use.
It's tough to draw any firm conclusions from log files I know - DPS and defensive dmg can vary a lot depending on whether the RNG fairy is smiling upon you or cackling madly at you. lol.
This weapon also has a very cool graphic - bubbles fly out all around you when meleeing. Plus when yielding a 1HB you get more requests for Temp and Virtue - lmao.