I liked it! I went not expecting much after reading some of the early news on the script, but I got wrapped up into the story quickly. I liked Tom Jane previously as Punisher, and wasn't looking forward to seeing somebody different, but I've gotta admit that the new actor had the "I'm pissed off and have no problem killing you" look that Tom Jane didn't have. He had the cold but not completely heartless expressions that made him believable in the role.
Really the only part I didn't like all that much was the mannerisms they gave to Jigsaw... I've never been a major reader of Punisher books so I'm not especially familiar with how he should act but....he just didn't really seem to fit well, almost felt at times like he was trying to channel Dark Knight's Joker, and it didn't really work for him. The brother though, he was a hoot! :-)