[hide]This was a solid, and very deep film.
Venom is overrated, a gimmick character who has only been properly explored in a handful of storylines . Raimi is a Lee/Dikito/Romita pursit and developed the characters that HE cares about, he's said on record he used Venom at the insistence of Marvel and under absolute protest. The original ideas were to use The Vulture, The Chamelion, or Mysterio alongside Sandman and Harry.
Raimi has since become a fan of Venom, and given how the character met his fate, I can see him returning pretty convincingly for the fourth, but Marvel are to blame the most for rushing the character.
The Symbiote aspect of the storyline was developed superbly though, right down to the effects it had on Peter. A lot more comically executed than the way it affected him in the cartoon (the definitive version of the story), but the battle with Sandman, Peter boasting that he had "killed" him, and the Jazz Club dance scene, leading to his punching out MJ added to the more dramatic and gripping parts of Peter's corruption.
Sandman was handled very well, they used the modern version of his character, a flawed, humane outlaw who suffers from misunderstandings and poor circumstance, and created a humble villain who did'nt want to be involved in the bigger picture, but the love of his daughter forced him to be there all the time. The final exchange between himself and Peter is astoundingly emotional.
And then Harry's arc was the best portion, the one villain who finds not only success in his insidious schemes, but also finds redemption, saving Peter's life at the cost of his own, but prior to this inflicting near permanent damage on Pete and MJ's relationship, damage that remains ambigious as to whenever or not it endured or was repaired by the end of the film[/hide]