Yeah I was taking about the level design. Seems like there is less emphasis on exploration, and more killing. I love exploration driven FPS shooters.
You can search the levels for secrets, but Painkiller is generally about blowing the living hell out of monsters in insanely gory and satisfying ways. Sorry to hear this wasn't what you were expecting.
Yeah, what this guy said. Painkiller harkens back to ye olden days of shooting, before you could crouch behind a wall and regenerate health, and before the "R" key was invented. The game is a bit creepy, but I really enjoy the feeling of blasting baddies in the face with knock-off Metallica playing in the background. I hope you have played a few more levels and liked the game.