dkclemons1: Well, I've gotten through all the parts of the first level in Painkiller. FPS heavy is right. The weapons are great (so far) and it's fun to have a little mindless shooting. I have to admit I'm slightly disappointed, though. It seems a little too simplistic to me. Correct me if I'm wrong, but you can't even crouch... Not that you'd need to, but I'm used to trying to take cover.
It's also been pretty easy so far, other than finding the secrets. I look all over the place and I can't find any of them. I guess I'll try guides for the secrets.
After you start a level, note what it will take to unlock the cards for that level. It keeps it very interesting. Some levels you can only use the stake gun, others the painkiller, another you can't take ANY damage... on one you have to collect ALL the souls, or ALL the money... its a nice change of pace to simply running and gunning.
There is no real cover mechanic. Think (serious sam) but in a more ambient setting ;)
Also, the secrets are incredibly well hidden. Even knowing their location is only have the battle.
If you don't like the rock music you can turn it off by setting the music volume to 0. This makes it much more enjoyable to me, but some love the music.