You might be pleasantly surprised at Stark's role, or you might not.
I had no idea Michael Keaton was in Homecoming, and hadn't seen any trailers (I close my eyes when they play at the cinema). I did think of Birdman when Keaton first appeared, but while there seemed to be something missing, he was good enough to take my mind away from Birdman after that initial surprise.
I enjoyed the film, but it wasn't one of my favourite superhero films - and not quite up there with Wonder Woman or GotG2. I also prefer Toby Maguire's Spider-Man 2 & 3.