OK, One thing that the critics of Peter and MJ's marriage constantly complain that there is no reason a hot supermodel/actress would stay with someone as "ordinary" as Peter Parker if he wasn't a superhero. Well, that's complete bullshit, as I'm about to detail.
1) PETER IS MORE BADASS THEN YOU THINK
Even setting aside "the girl next door" factor of MJ's backstory and there'd still be plenty of damn good reason for her to want him. First, Peter has shown himself to be a smart, funny guy. That's not inconsiderable when one is looking for a partner. Secondly, the idea that a science guy can't get a beautiful woman, well, that's just silly. I know plenty of science and engineering majors who've got some very attractive married partners, so that's completely wrong.
"Oh, but MJ's a MODEL, what would she see in a poor Photographer?"
In case you're wondering, the answer is already there. MJ is a model and Peter is a (talented amateur) photographer. That gives them a common frame of reference because they could easily "talk shop" (i.e. How to use lighting, composition, color, etc.). Not only that, but when one considers that Peter's primary job is to track down dangerous superbeings, take pictures of them in battle and survive, it makes Peter's job very dangerous and sexy. One imagines that being on a supervillain beat is akin to a crime or war reporter. Danger like that can be quite attractive to quite a number of people, especially those in need of sensation and excitement that they normally wouldn't find on say, the runway? Just a thought.
2) MJ's career isn't as amazing as you would believe.
Remember that before her marriage, MJ was a struggling actress and only moderately successful model. Not exactly super-riches and all that. Most of her "superstardom" was introduced AFTER the marriage as a way of keeping the "Drama" intact via a lot of really cheesy stuff about the fakeness of Hollywood and such blather. So it stands to reason that whilse she worked hard at being a model, she wasn't exactly going to be the world's greatest. Nevermind that there are very few models with longevity in either the acting or modelling arena.
Anyway, that's just one more rant on why the Spider-Marriage should work, but Marvel wants to cry about how it doesn't. Well, I can't help their lack of imagination, intuition, or common sense.