You seriously think Sandman and Kraven would have had as large of a pull on the audience? No.
Depends how they were executed.
Riami is a very talented director. With the proper script and actors they could succeed.
They made Sandman work, didn't they? Even Harry's Goblin was great.
Venom is easily one of the top popular Spidey villains and marketing jumped on that.
Which would have only been a short bump because the movie failed to capitalize on it by making him a minor villain who acted more like a clown.
That's why it would have been a better idea to save him for Spider-man 4.
Blade Trinity is a horrible example to parallel to because in no way is Blade as known as Spider-Man.
The public still liked the previous movies to give it a chance. It still did very well despite the public not liking it. It would have much, much better if they had liked it.
Without those previous films it wouldn't have done half as well.
Like Spider-man 3 it wasted its villains, only it did not only worse since it was only Venom hurt by it but on a bigger scale. The concepts of Parker Posey's group, the government hunting Blade, Hannibal King, Dracula and the Nightstalkers could have all been good enough to keep the audience occupied with a fun story separately only it tanked all of them and destroyed the franchise's credibility in the process.
X3 also didn't have the same situation because of the pre-production mess they were in with Singer leaving.
That did hurt it but it was much worse then that.
Singer set them up beautifully with his films for the Phoenix Saga and they did nothing with it. All it had were the actors and the previous good films rep to lure people to see it. If it was an actual good movie like 1 and 2 it would have made much more money IMO. They definitely would not have had to abandon the primary X-men franchise by just focusing on spin-offs, too. They could have made X-men sequels and spin-offs.
They should have saved the cure story line for a sequel, too. It was a potentially great lead into Apocalypse instead of just rehashing Magneto again for the third time.
Sony forced Venom on Raimi and they knew it would make them money and it did turn a profit and broke records opening day.
The records would have been broken any way. Venom didn't really have much to do with that. That was in spite of the difficulties of venom. It would have made much more without that hinderance anchoring the movie down so it could reach its potential.
Like I said, short term gain. That burns out quickly and can turn off the repeat customers the next time you want to sell them something.
They hurt the franchise because they wanted quantity over quality, including damaging one of their big characters.
Given a good movie all to itself Venom could have bought it much more profits in the long term. But they only wanted short term and now Venom is in a bind creatively and his reputation is possibly damaged with the public because of it.
They would have gotten more financial success with him that way instead of forcing him into an already crowded movie.
This could have all been avoided if Marvel and Sony were more patient with their future sequels.
What it didn't do was have good legs because of bad word of mouth from critics, and non-repeat viewings from fans displeased with the quality of the film.
Fans weren't the only one displeased. Venom being there stopped the movie from reaching its potential as a film which means it never was able to reach its potential financially.
They should have had more faith in Riami and the franchise and stopped trying to imitate Batman and Robin by putting more villains then they needed into the story.