I really thought Homecoming wasn't good at all (only good scenes imo were the ones specifically between Holland and Keaton), and this seems to be following up on a lot of what made it meh.
It's a shame, because Mysterio is someone I've wanted to see in film since the very first Spider-Man movie, and Jake Gyllenhaal is definitely an interesting pick for him. I might end up seeing it anyway, but the trailer certainly didn't do much to convince me.