I liked it; it was a good MCU move. Though as a Spider-man movie I'd put the first two Raimi movies above it overall.
This seemed to be trying very hard to avoid repeating the beats of the Raimi movies, and while I understood and appreciated why they went that way - Raimi covered the teen soap opera and secret ID angles extensively, so there's no need to do the exact same thing here (and Lord knows we don't need the origin again) - I'm not so sure what they replaced it with was 100% gold.
For example, while giving a superhero a guy in chair/hi-larious nerdy comedy sidekick is a perfectly sound formula, it's also a very common one. Doing it to Spidey just makes him more like a CW show and less like the original. The thing about the Lee/Ditko Peter Parker is that he was a kid who felt like he had no support network at all. That made something like a cold or a fractured arm feel like a major crisis. This Peter has a buddy to dish to and watch his back, and Tony freaking Stark to bail him out when things go really bad. It's a very different feel.
Speaking of which, most of the Tony Stark and Happy screen time was filler. Less of both of them would have had a bigger impact and made it feel more like a 15 year old kid interacting with big shots from another league. Instead it felt like someone said, "We're paying an arm and a leg for Downey and promoting this as Iron Man 3 1/2, so make sure Stark gets plenty of pages" even when it wasn't needed for the story.
Moreover, the whole "Peter decides to forgo being BFFs with Tony Stark and hanging out with the Avengers" theme is a total tangent to the core street-level character. While they did a good job of dealing with it, Peter being a Stark protege is a problem they made up for themselves, so I'm not really inclined to pat them on the back for their skill in making it go away again.
On the plus side: Peter and his friends actually acted like teenagers for once, better pacing than the Raimi movies, nice re-conceptualization of the Vulture in terms of character and theme, the alien-tech scavenger idea was solid (and retroactively made Luke Cage make a lot more sense, though again that's untangling a knot they made themselves), the action was good (if not outstanding), and the Cap cameos hilarious.