And for some reason, this really bothers me :

They add that bit in the alleyway, presumably for Boomers to spawn in, but they don't spend the extra 30 seconds to make sure the ground texture lines up. It seems representative of the whole campaign...
In the early levels of Dead Air last night, I constantly found myself trying to leap on top of buildings that were clipped off for no reason, with no signs saying you couldn't get up there. The crane event had the fences removed, providing Smokers with an insta-kill spot on an already pretty Smoker-friendly level.
I climb up the buildings on map 2 and can't see in to where the Survivors spawn due to visibility optimisation...

They could have totally justified that Smoker "insta-kill" spot if they'd just taken that fire escape on the right hand building and moved it over to the left, allowing Survivors the chance to walk down a few stairs and then drop down to the start in order to rescue their fallen teammate at the cost of having to repeat a section of the level.
The finale edit seemed to consist entirely of adding a truck for the Survivors to corner-camp on top of during the horde, before kiting the Tank around the nearby plane, practically mirroring the 'enclosed area and open area right next to each other' problems that the Blood Harvest finale has.
Map 4 broke the trend set by No Mercy and Blood Harvest by not being completely terrible and actually seemed rather fun. But the whole thing seemed so... familiar.
Dead Air and Death Toll Versus are the other half of the game we paid for all those months ago, they're not new, free content like the TF2 unlocks or Survival mode, and looking at Dead Air (which, to be fair to Valve is the only bit I've played so far) I can't see 5 months of work in it. I can't see 5 weeks or even 5 days of work having gone into editing Dead Air for Versus mode. I don't see why they've held on to it for so long when it could so easily have been slipped out several months ago, followed a bit later by Death Toll, followed today by Survival mode.
As we're still without the SDK, we still haven't got "the full game" that should have been there on release, and even disregarding all the stuff they've broken with the patches, I'm feeling a bit sadface about the whole thing.

I assume I'll be back here later with more screenshots after I've played Death Toll... see you then !