Since I'll be seeing the sequel:
-Absolutely little-to-no bumbling, incompetent or laughing-stock Spider-Man.
We get he's a kid, we get he's inexperienced compared to the other heroes, and we already had three films now that have told us again-and-again that he's so young and naive with his talk of "really old movies" and need of wanting to impress/be like his his pseudo father-figure. Now that we'll be heading into his sequel, it's time we get a Spider-Man that feels more like Spider-Man. Some baggage will carry over as expected (i.e. him being more Miles than Peter, Stark Suit, being so stuck to Stark in general, etc.) but let's get back to his roots a bit.
-No AI.
Made Spider-Man feel too much like Iron Lad at points and with the forced arc of Peter realizing he's more than just a suit
doh
over, there's no reason to see anymore of this foolishness.
-Web swinging is a must and a lot of it.
Got a few glimpses of it in Infinity War and we need to see more.
-Less forced humor.
I know it's the MCU and humor is gonna be prevalent but for all that is holy cut back on some of the lame dialogue. I don't need to see Peter bring up pop culture references or Ganke saying he's watching porn.
-Less Aunt Tomei and more Aunt May.
We get that Marisa Tomei is attractive and we were reminded of such almost every time she was on screen in Homecoming, but now that she knows Peter's identity, it's time she's more like the motherly figure she's meant to be as opposed to "cool big sister".
-Give us something with Uncle Ben.
Address the elephant in the room for Pete's sake (no-pun intended) and let us see more of Holland's dramatic acting chops come out. Contrary to what the MCU would have you believe, Uncle Ben is Peter's motivation and that needs to be showcased. Plus, wouldn't this flow perfectly with May knowing Peter's secret?
-Fix or scrap Michelle.
She added nothing to the film other than be annoying and serve as a mere 'easter egg' with her whole initials. I'm aware she's gonna be around for a while yet so either have her contribute to the story in a meaningful way or drop her, which leads me to..
-Mary Jane Watson.
It's been 11 years since we've last seen MJ on the big screen and that portrayal wasn't exactly great. Not sure how Marvel Studios feels about MJ in contrast to the Marvel Comics crew, but she is Peter's true love and absolutely vital to his world. Please introduce her.
-Better CGI.
Spidey looked like a video game at some points in Homecoming.
-More heart
-More focus on the duality/cause-and-effect of Peter/Spidey.
Only got glimpses of it in Homecoming and it's a vital part of his character.
-Flash Thompson that is more like Flash Thompson
That's pretty much it.