I saw it last night.
Spoilers follow:-
The Emo thing was awful. I felt it was patronising - as if the audience aren't going to realise this is 'bad' Peter without eyeliner and a Hitler haircut. I was cringing the entire time.
It was over-indulgent. The whole funky strutting down the street was fine, it just went on 4 times too long. The second film had similar quirky bits (I'm thinking the 'Raindrops Keep Falling On My Head' interlude) but they worked because they were brief and amusing.
I really wanted Peter Parker to grow a pair. He spent way too much time crying or with his lip quivering. I know he's a geek and a nerd - that's fine. But there were so many shots of a single tear rolling down a cheek.
Sandman - why? He clogged up the story. There was no need for him to be there. Venom was an interesting villain and deserved more story - but every different thread was clumbsily vying for screentime. They didn't crossover or link in any coherent way, they were just there. The whole movie was a series of different stories cut-and-pasted in a revolving sequence.
I liked the whole theme of duality (Harry/Green Goblin, Good Peter/Bad Peter, Spider-Man/Venom, etc) and that should have been the focus of the narrative - that should have linked all the threads together.
I did like how they did the Symbiote gunge and Venom was excellent. I also liked Harry's story, but the entire amnesia thing was the most blatent plot-device I've ever seen and completely unnecessary.
And why did Peter end up at the church at the end? Have I forgotten something from the previous films that makes it significant? I can forgive the coincidence of Eddie Brock being there as a contrivance in the spirit of the comics, but the church had no relevance to the plot - it should have been introduced at the very beginning and then returned to.
The way in which the Symbiote is weakened (the sonic wave wotsits) was clumbsily introduced, but I thought the scene where he forces it and Brock apart was very well done (I envisioned Spidey just whacking one of those steel poles on the floor repeatedly like a caveman:lol
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Short of re-writing the whole thing, it needed major editing. Some films you come out of thinking they were too long, but not quite knowing which bit you'd cut out. In Spider-Man 3 I was deleting entire scenes as I watched them. There was a much better film to be had in there.
Less posty, more gamey.