Just got back from it and holy crap, this was bad. For starters, the biggest issue here is the awful dialogue. It's so heavy handed and expository it made me want to start a Kickstarter to pay for these guys' writing classes. At any given time a character will drop completely arbitrary information that doesn't make any sense in that situation, but they couldn't find a clever or even subtle way to deliver this information to you. It's absolutely painful to sit through any moment where characters talk for more than ten seconds. Think about that for a second.
Also, this has to be the worst movie soundtrack I heard in years. It's a clusterfukk of all kinds of different shyt just thrown together, you got Hans Zimmer doing typical superhero blockbuster compositions, then suddenly it's some weird electronic dubstep bullshyt courtesy of guys like Junkie XL and Pharrell (those were the names I recognized from the credits where they're listed The Magnificent Six, presumably because Sony wouldn't actually let them use Sinister Six), and somewhere in between Marc Webb's influences seep through with corny hipster indie songs.
The only thing I liked about the movie was Dane DeHaan's performance as Harry Osborn. Dude was killing his part, right up until the point they just had to go and force him into the Goblin role again like they did in SM3, for no other reason to rush their Sinister Six set-up. They completely shattered his performance with that shyt, just like they completely shattered the emotional impact of the movie's only successful dramatic moment because they thought it was more important to set up their cinematic universe than have a character deal with his personal issues for more than three minutes.
I didn't have high hopes for this movie to begin with but when you've got only one memorable scene in a two and a half hour movie, and you can't even follow up on it properly, you done fukked up.
P.S. The trailer literally had the last shot of the movie in it, and if you start to add things up you will realize this nearly halfway through the movie. Bonus points if you can guess it before you see the movie!