I think it has a Spider-Man 3 vibe to me.
I didn't think so. I didn't get that feeling at all. A lot of the characters are just small cameos, which really weren't necessary to be there other than to say Justice League is coming. They're not bad. I enjoyed them, they just weren't necessary and maybe would have worked better as a post credits scene (which there isn't one).
My biggest issue was with the pacing in the first half of the film. You can tell stuff was cut. There wasn't anything I really disliked, but the scenes just felt a bit disjointed.
It's definitely a film for the hardcore fans which is why I think it will be divisive among the general public. As a Batman fan, I prefer him solo in a more grounded world as opposed to being with super-powered beings, so I'm not going to be as high on it as some fans. I did like it, but acknowledge its flaws. I need to see it again before I feel like I can really rate it. I am excited about a solo Affleck picture, especially if it takes place before BvS as rumors suggest.