<Snipped quote by AndyC>
I think due to his age we wouldn't have gotten Iron Man Jr. very much. Do you have any tasty Andy theories on how it would've gone down?
So, assuming they'd take the Ragnarok approach and throw out the style to make Spider-Gar fit into the MCU style:
-Spidey gets pretty much the same role in Civil War, with the exception that he's in college rather than high school. Pete's got his own suit, so he's not as dependent on Tony, but maybe they skip straight to the Iron-Spider stuff to solidify that.
-By the time he's in his own movie, he's "gotten over" Gwen the same way that everyone in the MCU seems to brush off their romantic interests leaving them. At best, she gets an off-handed mention when he's talking to Aunt May, or maybe when he's having a flirty scene with totally-not-Mary-Jane-wink-wink.
-Harry Osborn, now cured of his Goblin-ness, is working as sort of a reverse Nick Fury in the background to gather the Sinister Six, so he gets the post-credits sting recruiting this film's villain (let's go ahead and keep Vulture because he was great).
-Assuming Sony plays ball with Marvel and doesn't shoot themselves in the foot like they're doing now, Eddie Brock is introduced as the Bugle reporter Pete works with. No symbiote stuff until at least after Infinity War.