The movie is enjoyable and the action is very well done; however, there are some massive flaws that prevent it from being what I would call a "good movie". There's tons of hokey shit, lame cliches (looking at you Sandman's story/motivation), and other stuff that's just plain dumb (like Sandman himself, symbiote's origin, emo Pete). I really enjoyed how Harry Osborn's story culminates in this movie, although it is pretty predictable.
Topher Grace's Venom obviously leaves a lot to be desired (at least when he's showing his face), by the way.