1.) Sam Raimi's version of Venom and Eddie Brock, Jr. was a combination of 616 and Ultimate, but yet when it comes down to Green Goblin, Doc Ock and Sandman, those versions were from 616, so why bring in the Ultimate version of a villain that he could've just wrote as the 616 version, gotten a bulky character to play Brock and made Venom more bulky also, possibly twice the size of Spidey and less Venom fans would've dissed the character that was portrayed in the movie.
2.) His many arcs could have been dealt with, getting fired, his interest in Gwen Stacy and him becoming Venom, but all three were too rushed only to have scenes with Peter and MJ that were too boring to watch and I almost actually fell asleep during the restaurant scene because it was unbearable. If
they played it out nicely, each character could've had their time to shine, but instead, Sam Raimi turned out to be a blockhead because even with Avi Arad wanting Venom, he still gave Venom the fewest amount of screen time and cut out pretty much half of Eddie's screen time, and the same for for Sandman's scenes with the doctor and his family only to make this movie become equaled to Superman III and Batman Forever just because he was stubborn. If he wanted all three of his movies to be fantastic, he should've grew some balls and take the time out to keep all the needed time for each character.