I've played Painkiller, Serious Sam and several other twitchy shooters.
 
Maybe I'm just in a good mood or something, possibly because it's free, but so far I'm enjoying Dreamkiller more than Painkiller. :)
 
I guess I should also note that I'm listening to a podcast while I play. I can still hear the game audio and stuff, but I'm not 100% invested into the game, so perhaps that's dampening the repetition a bit. That said, I still think it's "up there" with Painkiller as what's a basic and old-fashioned style of shooter.
 
I'm even thinking about buying it to finish it, though I'm halfway through it already. :P

You're a very bad person.

i have 1.4 days left?
 
is there some kind of steam promotion on?

ive played it a bit and i'd say its not bad but its not the best game evr ive played =P
 
but i'd say give it a try if it dosent catch ur interest leave it be =)

You're kidding, this is actually pretty awful. The weapons are the weakest pieces of shit I've ever used. The enemies are extremely repetitive as well and the levels are insanely long. I've never had a level I thought was going on for too long and desired to see its end just to get through like I have in Dreamkiller. It's so monotonous and uninspired. The story concept was great, going into dreams like a Psychonaut Psychologist, but the development team is just not capable of delivering even a pizza. This was disappointingly monotonous for even a mod, let alone a full blown professional game. The game could have had potential, if it tightened up and had some real designers behind it, but as it is it's too bland to even call uninspired.