I thought War Zone sucked balls personally, I barely managed to sit through it. It had the grittiness that is apparently part of the whole Punisher style but seriously, I didn't give a flying shit about what I was seeing on the screen, it was just a sequence of pointless scenes and action that was forgettable to my eyes.
I never read the books but from an outside perspective I thought the Punisher with Thomas Jane was a far better movie, it even managed to get you somewhat invested in the character thanks to his acting. Also the scene with the Russian made me and my friend laugh our asses off, although I'm not sure if it was supposed to be funny.