The writers (all six of them) did a great job setting the whole thing in high school; another aspect that I wasn't sure would work but they nailed it. The story was engaging and the plot wove well into the rest of the MCU. (You will have to go see it to understand!)
I'm not going to talk about theme or story structure or characters. What I am going to do is reassure you, this was the best decision Sony made. Each Spider-Man film before was good and contributed in their own way but in my opinion "Homecoming" is the best so far and I have always maintained that Maguire is my favorite.
Oh, stay for the end of the credits!