Why aren't you reading Winter Soldier? You should be!
i see The Punisher as one of my favorite characters, and that is not because he is main stream as the other characters in marvel it is probably because he is more of a cult read, it is a character with a lot of psychological issues.
i loved read the MAX series by ennis and that will always be one of my favorite series by marvel, i would love for them to go as dark as that with him more, i am not a big fan of the stuff when there is a lot of cameos by other characters in the marvel universe
What would make me buy Punisher? Lets see....
1. Change the writer. Rucka is still trying to live out his Gotham Central days by making this an uber realistic cop series. Replace him with someone who can do some good street level characters or add some realism. Go grab Bendis or Millar. Bendis did a great job on making street criminals/mob affairs in his DD days. Millar could also give it that cinematic edge that he needs.
2. Update it. Punisher is a great character to face real world style problems. The Punisher should be taking on terrorists, Somali pirates, drug lords in border towns, crazed ptsd war vets, evil wall street billionaires with private security contractors at their whim, African warlords with child armies. Throw in some marvel elements like stolen stark, richards, and doom tech or the recently missing dna from most of the avengers and you can have some exciting stories. Likewise if I was writing it I would start by getting a list of Marvel baddies who aren't cared about or are unimportant - so Punisher will have plenty of people he can kill off.
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Place him in World War II or just after it, hunting Nazis.
Kind of lol'd at the idea of Millar writing the Punisher as well. It'd most likely just be mindless, over-the-top gore and violence and little of anything else.