3. Venom
Spider-Man 3 failed on almost every conceivable level, but by far the biggest let down was Venom. Topher Grace was completely miscast, and the way the threequel rushed through everything from the symbiote's arrival on Earth to Eddie Brock's transformation and plan to kill Spider-Man stunk of the character being a last minute addition shoehorned in by clueless producers and studio execs in a bid to drive up ticket sales. Make no mistake about it; this was Venom in name and appearance only. Hell, the movie didn't really even get that right. While it was cool seeing the teeth and all that stuff, he was far from the hulking brute who so easily overpowered Spider-Man in the comics and ended up being yet another lead villain that this franchise decided to kill off. Everything about him is just frustrating on every level and a real wasted opportunity.