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Other revelations from One Moment in Time also endanger the structural integrity of your house. Way back when Peter and MJ were supposed to get married, what did Mephisto actually do to prevent it? A red pigeon (Mephisto in disguise, we're pretty sure) caused an overweight common thug to escape from a police car, Spider-Man got hit on the head by a cinderblock trying to catch him (Spider-sense? What's that?), then he got knocked out when he fell off a building with the fat guy on top of him, causing him to miss his wedding.note And remember, Pete canonically can lift several tons without getting tired... I would say it makes sense in context but that would be a lie - it only sucks more.
The mere fact that OMIT was so late and the artist was so lazy they reused art from OMD deserves mention.
MJ compares her life with Peter to the abuse she got from her father — the emotionally abusive, alcoholic father that pushed her into becoming a Stepford Smiler for years — and gives this as a reason she'd never have kids with him. Yeah...
The resurrection of Aunt May is accomplished with a Cosmic Retcon which changes decades of Marvel continuity, including returning Spidey's Secret Identity, even though Quesada himself explicitly said this would not be undone by a "magic retcon."
To be fair, it was eventually clarified that the only thing that was retconned was the marriage; other stuff like restoring the Secret Identity happened during a Time Skip afterward. Even then, the marriage was just changed into living together, altering previous relationship subplots very little. "One More Day" has a lot of problems, but invalidating canon en masse doesn't seem to be one of them.
In one part of this event, Spider-Man enlists Dr. Strange's help to save Aunt May. Strange (Note: Doctor Strange is his real name, not an adopted title. He's a surgeon as well as Sorcerer Supreme.) casts a spell that allows Spidey to be in multiple places at once to find someone capable of treating her. Apparently, no one in Marvel Earth is qualified to treat a gunshot wound. Not even Elixir of the New X-Men. Elixir, who regenerated Prodigy's heart after it was quite literally ripped out of his chest by the demon Belasco, could not treat a gunshot wound.
Strange's spell even allows Spider-Man to beg for help from his enemies. Including Doctor Doom, all of whom either can't or won't do anything. It makes sense that most villains wouldn't want to help, but Doom of all people should have been more than willing to heal Aunt May in return for having Spider-Man in his debt.
The rest of the story is par the course for comic books. MJ and Peter breaking up might be tolerated, but this was too much. Dr. Strange literally has God on speed dial... several gods, in fact. Reed Richards builds time machines! Elixir's power is best summed up as "Heals shit." They somehow can't deal with a common everyday gunshot wound. Not a headshot, not a special bullet, not some magical Uru round or Wakandan anti-metal shell or something. Just a bullet from a gun... that somehow stymies a superhuman genius, a literal God on Earth, and a man who can rewrite a person's DNA with a backwards glance. That wrecks the story as much as the deal with the Devil because it just doesn't work on a basic, narrative level.
Worst of all in this is that it would have been pathetically easy to justify Aunt May's death gracefully. She's a frail old woman, the injuries are severe, and the additional strain to her system that healing her would entail would kill her anyway. Why hasn't this been a problem in any other case? Because none of the other cases involved a frail old person being healed of otherwise fatal injuries. Aunt May happens to be an outlier.
Combine the above with the actual statement about Aunt May being at peace with dying to offset supernatural healing or storming heaven on her behalf.
The way time travel works in the MU (this week), is that Spidey going back and changing time would spin off an alternate reality, instead of altering his own. Reed still should've been able to find some way.
"Find a way?" Reed Richards, when Ben Grimm was killed, literally built a dimensional transporter that could access heaven, picketed the pearly gates, and complained loudly to all the angels until Jack Kirby let him into the inner sanctum and agreed to bring Ben back to life. He would have reacted to Peter's question of "can you fix her?" with uncontrollable lol'ing, that's how idiotic it was. And it wipes out any argument he might've made about not interfering with the natural order of things (which is a philosophy Reed never bought anyway).
It was, however, mentioned in the last issue of that storyline in Fantastic Four that using Doom's machine wouldn't be an option again. The point stands, though.
And just to put a point on this, we later found out how Peter got his Secret Identity back, and it's because Strange, Richards, and Tony Stark pulled Laser-Guided Amnesia out of their rears.
So instead of a Magic Retcon, it was a Techno Magic Retcon?
A lesser example than most for Quesada, but his decision for how Reed Richards and Tony Stark gave everyone laser guided amnesia to keep Spider-man's identity secret qualifies. Those two just finished fighting a war in part to make sure that meta-humans couldn't do that sort of thing to regular humans and now they're the ones erasing memories?
A global scale techno-magic retcon by the same freaking people who couldn't treat the aforementioned gunshot wound.
You think this is bad enough? Peter met GOD (or angel) and he told him to have faith that she will get better. While he could like... you know.
This comic has been bashed by so many people not only for the stupidity, but also for gaping plot holes in the devil's powers. See Linkara for several reasons including that the devil is a Manipulative Bastard.
In a September 2010 interview, JQ revealed that due to MJ's use of Exact Words, Mephisto had accidentally retconned the deal itself out of existence. Think about that again (even though those Exact Words could easily be corrupted in any number of way by a sufficiently creative individual, let alone an immortal embodiment of pure evil).
To cap this all off, the entire plot openly ignores the main Aesop of the Spider-Man franchise: with great power comes great responsibility. Because Peter revealed his identity to the world and his loved ones were hurt, a scenario he had been standing behind for decades as to why he wouldn't reveal his identity, he made a deal with the devil because he couldn't take responsibility for his actions.
Then there's the fact that Aunt May had "died" several times before, was probably in her eighties, and had lived a fulfilling life, while Mary Jane and Spidey had been married for, what, only a few years (comic book time) and there had been a lot of punctuation on how great they were together. Congratulations Pete, you let the love of your life go in a Deal with the Devil to save a woman close to death anyway.
In a vision, her spirit even tells Peter to let her go and that she wants to see Uncle Ben again. But no, Peter refuses because of his own personal guilt. Yes, the With Great Power Comes Great Responsibility Peter Parker does this. Nice job Petey: not only did you ruin your own life and the lives of your wife and future child, you also prevented your old aunt from happily joining her deceased husband. FAIL.
Peter manages to revive Aunt May with a combination of CPR and The Power of Love... even though she was shot and someone with superstrength pumping on Aunt May would risk either crushing her or reopening the wound pumping all the blood out of her, and his attempts to revive her by contacting everyone in the world who could possibly help didn't count in the original timeline.
Worse, the CPR, if we are to overlook the fact that, as demonstrated above, would do more harm than good, only kept her from dying in the short-term, it did nothing to heal the massive trauma she suffered from the gunshot wound. You know, the one none of the greatest scientists and magicians of the Marvel Universe can heal. How did she go from "death-just-temporarily-staved-off" in OMIT to "perfectly healthy" in Brand New Day?
One Moment in Time's solution to how May survived ironically turned the entirety of this saga into one giant Shoot the Shaggy Dog. Mephisto's deal accomplished nothing. At the end of the day, despite the Cosmic Retcon, history still repeated itself. Peter still took part in the Civil War, he still unmasked himself, and Aunt May still was shot and sent into comatose. The only difference was that in this new Universe, instead of being approached by Mephisto, Peter went back to the hospital and performed his magical CPR. In essence, the only thing the deal itself accomplished was erasing Peter and Mary Jane's marriage from existence.
Which just goes to show the lengths that Quesada went to destroy the Parker marriage, something he was known to hate for a very long time.
It also raises the question why, if Mary Jane valued children as being such a vital part of married life, and all previous stories before OMD happened as they were except for the Parkers being married, why wouldn't they have gotten married when MJ got pregnant with baby May?
Why, for the love of God, did Spider-Man listen to Mephisto of all people? He should already know who Mephisto is, having dealt with his son in the past, so he should know that the guy is basically the biblical Satan! So if you know that the literal devil wants to make a deal with you, why the hell would you follow up on that offer, especially if you're one of the smartest, most moral and kindest superheroes around?!
Not to mention he's friends with someone who has been royally screwed over by Mephisto. You'd think he'd know better.
One of the best things about JMS' run that OMD ended was having May finally discover Peter's secret identity, then sit down and talk about it. The next few years saw Pater and May finally develop a mature parent-and-adult-child relationship, as well as strengthening May's relationship with Mary Jane. All gone thanks to the mindwipes.