The character of Peter Parker is evidently not the one regularly seen in the comics. There were hints and wavers of the essence of the source character in the first movie, but was gradually lost when the second movie came around. By this point in the franchise it would be strange to start altering his character. What we can hope for however is that they handle Symbiote Parker with respect to it's source. Use elements that were seen in the comics, as some of the material was good stuff and would benefit the movie greatly with it's inclusion. As for Brock, it's safe to say his character rarely shares traits with his comic counterpart, I just hope that unlike Parker, Brock's character has been altered for the right reasons.