The damage the bullets and stabs do depends on what wave you were on, on wave one you could kill a zombie with a single headshot, maybe two. But if you hit them anywhere else in their body then it would take 6 shots to kill them. I like this though because it meant you could shoot them 5 times then stab them for maximum points. Then on wave 2 you could pump about 7 bullets into them and then stab to get most points.
It basically goes wave 1 = 1 stab to kill, wave 2 = 2 stabs to kill, wave 3 = 3 stabs to kill etc. so the zombies get harder as you go up the waves. My record on Der Riese was wave 40 and by then the packed Browning did nothing to them I just had to resort to Ray Gun & Wunderwaffe. I would like it if the zombies stopped getting stronger after say wave 30 but they came in larger numbers. That would be more fair!
Right now onto Darksiders...! I loved number 1, thought it was really good. I would not compare it to God of War though I would compare it to Zelda Ocarina of Time. You can tell they massively took influence from that as like with Zelda there were 5 temples each with an item you would unlock that would help you beat that boss. Darksiders is pretty much exactly the same, the whole map and the whole way it played was very Zelda-esque. It will be interesting to see if Darksiders 2 is similar or if they are trying to make it more like GOW, I haven't watched any trailers as I just want to wait and get the game.
If they have made it more like GOW then that will be cool, but I do really like the first ones gameplay, it was quite good to feel like I was playing a game from the past.