The [u]random[/i] city attacks are as fine as they are. People need to quit over-exaggerating something that is actually no worse and not much more frequent than the random Dragon attacks in the cities and the wild.
As I stated above,
I play on the PC so comments are all I can read to project how the DLC really is. Maybe this is just a silly thing that people may overexagerate or maybe it's a serious problem.
I have no clue how frequent or how much mess the new vampire attacks pose, but it sounds like it's a serious problem. I'll just have to wait and see for myself in a month, but if these "Ghost town" rumors are true - I'll be back on the forums again unfortunately.

A world without vampires attacking towns during a war between mortals and vampires makes about as much sense as a world where that same war ends, the vampires lose and yet they continue to attack and raid the towns fairly regularly.
I wouldn't mind if the vampires attacked cities and died, what I do mind is that people are reporting how a silly group of vampires is clearing the town without a problem. Plus, this feature could of been implemented just like the Civil War. Depends if you're a Dawnguard / Vampire - the organization plans an attack /defense on a city and your job is to attack/defend. It's far better option in my opinion than random vampire attacks.
And lets not forget that the only feeling we got during Civil War by invasion, was the planned attacks on cities against respawnable npcs. The Stormcloaks/Imperials did not randomly attack cities.