I am not sure about the numbers, but the first day I was playing with this, I hit Gula twice for 1200 points. The first Shroud I ran I was critting Harry (with no condemation applied) pretty regularly for around 600.
Yesterday I realised that I did not have the Prayer of Incredible Smiting line and respecced. Didn't go back to Gula or Harry, but fought a rare, the horned devil I think, in the Shavarath wildreness area and hit for 1500 something.
I am using on a Favored Soul Evoker build with the full smiting enhancement line, a Skiver in one hand and the Virt necklace. I have to imagine there are people seeing higher numbers with better equipment than I have, namely the Eardweller.
I too was pretty amazed at how powerful this spell was, especially in the hands of an AOV FvS.
That was, until I got on my 20 Sorc, and made her a Water Savant. There is no comparison to the raw amount of DPS the new Sorc Pre's bring. First Shroud with her, and 2 other water savants, was pretty impressive. The new standard of DPS in the Shroud will not be how many rounds part 4 was, but what fraction of a round it was. In ours he was dead in 2/3 of a round.