OK so I realize this is turning into my own personal diary since nobody is commenting anymore on this thread but that's OK. I have to finish this, its my mission now. So on to the next set of impressions you luck dogs.
First off some may recall that Resurrection is not the critics darling. Lots of criticism on bugs, level load times and level design being random and inconsistent, lacking flow etc. I can't comment too much on the bugs because I'm patched. No lockups, crashes, or anything of that sort reported is affecting me. The only bugs I've encountered are because of level design (more on that in a sec).
The big difference here, and its a huge one, is the ambition behind this project. There are only six levels in this expansion. At first I thought it was a ripoff, but these levels are absolutely HUGE. Normally it takes about 25-35 minutes to rip a Painkiller level. I'm on the 3rd level and I haven't completed it after 1:33. That is why the load times are long. The engine improvements are nice. Volumetric fog and HDR a bit are a bit abused, but the levels themselves are the big difference. Not only are they massive, and the ARENT LINEAR which is a major departure for PK. High level detail and massive verticals are a norm for Resurrection. I have to sort of feel bad for the level designers here, they really busted their asses creatively. There is true inspiration in the twisted abstraction of reality and the lack of linearity lends to the immersion. Unfortunately, it can also lead to bugs. Creatures get can get stuck in the cluttered areas exposing the weakness of the AI, and you'll notice a quite a few monsters taking the plunge off cliff faces. That may not pose a problem for you, since the devs throw endless hordes at you. I'm talking over a 1000 here. The game is pretty difficult and for the first time, like the Serious Sam series, you'll find yourself thinking twice about how "lucky" you are you stumbled upon those nice caches of weapons and armor. Just like the Serious Sam series, taking said goodies results in all sorts of hell breaking loose often leaving you off worse than when you stumbled upon the goodies. Also like the Serious Sam series, the devs will throw some "fan service" at you sending exploding barrel carrying monsters at you in a constant (read you can't miss) stream so you can enjoy the ridiculous volumes of exploding limbs and misc gore. That my friends, is a hoot.
But overall it is fun? It is a strange and twisted combination of exploration and frantic, carnage ridden gameplay. It does work, but the beauty and inspiration of the levels does take away from the core gameplay mechanic, not much, but a little. PK was always a much simpler game. Resurrection adds a new dimension I find interesting but if it was hot off the heals of the original PainKiller game I might be miffed the core goals of the game had been altered. But, luckily for me, I'm not!