This movie is my all time favourite. I loved the bank fight with all the coins spalshing, and the....all of it. But the train scene was epic. EP-IC!
Some problems I had was at the end when Ock reforms, to quick. "Uh.. oh yeah I'm a mad scientist. Best go sacrafice myself." Ok that was flippant but it seemed quick, and sill that he was talking, no reasoning to the arms.
But I loved the cafe scene
What I'd like in the next fil is for Harry to try and denie that the gobo was his dad, and try to redo the goblin suit. Make it say....orange

He does however start to strain over the visions of his dad. Also because he is nograt scientist he brings in Doc conners to try and fix up the Serum. However in a lab accident (blatent negligence by Harry, not carring about conner) Conner arm gets cut off. Parker is with him when he does the lizard DNA thing.
Meanwhile Parker is under strain perhaps he kills one of the thugs he faces, and all the villians he locked away (flash backs or small clips of him just after beating rhino etc) and he begins transforming. Cue Man-spider. Also if that tall blonde keeps making passes, and MJ thinks he's exploiting his superhero thing she leaves.
Now we have the back story with harry, Man-Spider vs the Lizard, two friends animal sides unleashed on each other. Maybe some very back story of astronauts, maybe even the hobgob suit funded for space use. Also Harry doesn't seem straped for cash, even though he talks about wasted money, having nothing etc. He gets the tritium, he still has his mansion. Not just a house.