YMMV / The Punisher Kills the Marvel Universe

• Broken Base: The story is lauded for having the Punisher kill nearly everyone in the Marvel Universe as the title promised, and in impressively pragmatic ways to boot, but also has a considerable number of detractors who see the heroes' deaths as being a bit contrived and the Punisher as being too unsympathetic and out-of-character to root for. In many ways, this one-shot could be seen as Ennis' dry-run for The Boys.
• Crosses the Line Twice:
  • The Punisher gets arrested because he shot the Kingpin's head off... and then got stuck when Fisk's corpse fell on him.
  • Frank's trial, specifically the judge stating, "...but there can be no excusing the fact that you murdered some of this nation's greatest heroes—and the X-Men Cyclops and Jubilee."
• Moral Event Horizon:
  • Frank crosses it when he kills Spider-Man, who wasn't even one of the heroes there when his family was killed. He even points out to Spidey that he is going to die because "someone has to die first."
  • In-Universe Frank believes he has crossed it when he kills Daredevil and realizes it was his best friend Matt Murdock all along, leading to his suicide.
• Older than You Think: Believe it or not there was a very similar What If story published before this one called What If The Punisher had Killed Spider-Man, where Castle is duped into killing Spidey by the Jackal and becomes targeted by every super-hero in New York. Interestingly, that comic took pains to illustrate the fact that Spider-Man's Spider-Sense would protect him from Castle's attempts to snipe him, and that in an all-out fight, Castle would lose. He only manages to take Peter down through pure luck, and after that, the comic then demonstrates that the Punisher is woefully outclassed by even minor heroes like Hellcat (though, in all fairness, Frank wasn't actively targeting any other hero).
• Too Bleak, Stopped Caring: The main premise of this comic is that the Punisher (easily) kills every superhero and supervillain for the crime of the collateral damage of their actions hurting people no matter how hard they try, calls them all pussies and blows his brains out once he's done. Obviously, not many comic readers would be able to stomach a story that bleak.
• Unintentionally Unsympathetic: Although the Punisher is supposed to be seen as a brutal Anti-Villain Protagonist rather than a straight-up hero, the attempts to make him and the cabal of people hurt by collateral damage from superheroes come across as understandable, if not commendable, doesn't quite take. Even his decision to not continue working for the organization and even killing the leader and calling the rest out out when they want to keep him around to kill any new supers (not subtly implied will include children) that will inevitably pop up has been criticized as being tacked-on as a last-ditch effort to make the reader feel sorry for him in spite of his actions, and being Driven to Suicide by the realization that his last kill Daredevil is really his close friend Matt Murdock, if anything, just throws into sharp relief how unjustified the rest of his actions in the comic really were.