Ugh. I think you went a bit too easy on this, Bob. One More Day is quite possibly the worst comic ever written and I think merely dimsissing it as "weird" doesn't even BEGIN to cover the mutilation it inflicted on the Spider-Man books. For one thing, it is unquestionably the most out of character thing Peter Parker ever did. He made a deal with the motherfucking devil because he was too much of a whiny mama's boy to accept the consequences of his decisions- way to go Mr. "Power and Responsibility". The story itself is irredeemably stupid to an order of magnitude that cannot be exaggerated- Aunt May gets shot by a sniper and Spider-Man, one of the most well-connected superheroes on an entire planet full of fucking superheroes can't find ANYONE capable of saving her life. Reed Richards builds time machines. Dr Strange has gods on speed dial. Loki, a literal physical GOD, owes Peter a favour. The mutant Elixer has powers that basically boils down to "heals shit" and once regrew a guy's torn-out heart with a touch. And even if YOU think it's nonsense to think that Peter would want to settle down and get married rather than spend his life fucking hot superheroines like Black Cat, well, that's completely contrary to the way Peter Parker had been written for the first 20 years of his comic life- a serious-minded guy who only falls in love a few times, falls hard, and sincerely wants to be married. But as you pointed out the Spider-Marriage was a wasted opportunity because the writers just didn't know what to do with it. That's not to say there wasn't anything that COULD be done with it, it just means that the books were afflicted with a lot of poor writers who couldn't think of anything for MJ to do other than sit around worrying about Peter all the time.
And since OMD and the dissolution of the Spider-Marriage, has it done anything to improve the story? NO! Brand New Day has been one of the most wretched lows in Spider-Man's history as he's been written out of character, the stories have been tasteless, dull and stupid and practically NO stories have been told that couldn't have been done perfectly well with a married Peter Parker (apart from the ones about him banging random girls who no-one gives a shit about), showing that Marvel's claims that being married "restricted" Spider-Man and that they had so much they wanted to do with a single Peter were completely full of crap.
Marvel have completely lost their shit over the last few years. It's truly tragic to watch, especially the horrible abuse they've heaped on what was once their flagship character. Quesada has to go.