Well, let's be honest - Spiderman was the only good thing about Civil War. He made that brawl about 2/3 into the movie worth watching all by himself, so an entire movie with the same snappy dialogue is bound to be entertaining. Spiderman has always been the most light-hearted and generally human of Marvel's superheroes as well (although Deadpool is arguably more entertaining) so that should generally make good viewing material.
That aside, Homecoming does not have much to live up to, given that the only good Spiderman movie that has ever been made is Spiderman 2, and that was due almost solely to Alfred Molina's superb performance. The poor quality of the ironically-named Amazing Spiderman films would make almost anything look good by comparison.
It also doesn't appear to be an origin story. THANK GOD.