I saw this a couple hours ago in Fullerton, CA. I was a reader of the comic, and am a fan of what we've seen from Marvel lately. This movie is just what I wanted, and what I expected.
Ray Stevenson is perfect as Frank Castle, and everyone else is at least good enough for an action movie. Dominic West is over the top as Jigsaw - which is what Jigsaw should be! A horribly disfigured mob boss with a vendetta is not a subtle thing to begin with.
As for the "respectable" critics' complaints: 1. Violence: Of course it's violent! What part of the title "Punisher: War Zone" implies peaceful conflict resolution? He's not the "Admonisher". The gore and violence is not at the level of a "Saw" film, but it is high. It is rated "R" for a reason.
2. Dialogue: I think the critics have been spoiled by "Dark Knight" and "Iron Man". Those were comic-book movies with extraordinarily good dialogue. "Punisher: War Zone" is no worse than a "Predator" or "Rambo: First Blood". Not great, but not awful. This is not supposed to be "Hamlet".
3. Script: The story moves along well, and when there's a break in the action (which isn't very often), the film doesn't drag- it's always going somewhere. Not perfect, but good. Much better than the critics have made it out to be.
All in all, a good time, and one that I'll buy and re-watch as soon as it comes out on DVD.
