After quite a few hours (not finished yet), I must say it is an excellent game and I'm having a great time. I'm surprised by the divisive reactions, specially about some of the issues people are having, like the stealth parts. They work great for me, if anything I wish there were more of them and they weren't so easy (Spidey is OP). But there is a lot to like in the game: combat works well, it looks amazing, it's well written and the main missions are great and have some very cool set pieces.
I could see people having problems with the camera, as combat arenas are big and very often you'd have a lot of people out of view. I didn't have a problem with that, thanks to Spiderman's mobility and his ability to zip towards people who are out of view, which works great to escape situations or counter weapon fire from out of view. Well, except perhaps with finisher moves, which use a cinematic approach that will mess your camera. I would have abused them a lot more if it weren't for that, but at least they give you invulnerability, disable bomb threats nearby, and leave all the AI in an idle state for a second, so you have some time to get away or check the situation around.
I must agree about the side missions, though. They are not that bad, but there are way too many of them and every mission of the same type is mostly the same. I specially hate the 'challenge tokens' missions, which not only are really bad, but half of the late unlocks in the game are locked behind them for some reason. Perhaps I'm missing something, but they just seem to be broken. For example, you are supposed to press L1+R1 when you're close to the items you need to collect, but half of the time the prompt just won't activate despite standing right there. [Edit: as I learned later, there are multiple kinds of challenge missions and this happens in only one specific type, but they are all terrible anyway, every one of them I've played had some issues].
The game also needs another patch or two, I've had multiple instances of broken missions because enemies got stuck inside walls or under the floor and I couldn't proceed, and two crashes so far.