This should be the one that gets me a couple assassination threats...
t:
http://www.batman-on-film.com/opinion_nolan-fanboys_awinckt_2007.html
I completely agree with your point that the movies are adaptations of the comicbooks, and that directors shouldn't concern themselves with fanboy ranting. But I disagree with how you argue this.
I have to point out, you seem to be guilty of the same "if it doesn't rock it sucks" mentality of fanboys:
"I cant think of a less interesting, more dull villain [than Venom] on the big screen"
Really? Venom was portrayed that badly?
I think the general consensus, as in what the majority feels, is that Venom was pretty great but the problem is that he was short-changed with screen time.
Now to your point that Venom shouldn't have been forced on Raimi for the sake of what the fanboys wanted.
Even great directors are not infallible, and comicbook movies don't come out nearly as often as comicbooks themselves. So if Raimi was reluctant to bring in arguably the most popular villain of Spider-Man's out of simply personal bias, then I think Arad and the studio were right in pressuring him to bring him in.
This wasn't the first Spider-Man movie, it was the third, so Raimi already made two movies with exactly the characters he wanted. And he was still using another of his favorite "old-school" Spider-Man villains for SM3, the Sandman.
So Arad and the studio told him, "Listen, don't be selfish." So what is so unreasonable about Raimi adding Venom? Especially since he was already planning on having two villains. And the other villain he wanted to have was the Vulture. I mean really, the Vulture instead of Venom? That is just ridiculous.
The fault doesn't lie with fans pushing for Venom. It lies with Raimi. He begrudgingly agreed to bring in Venom, and it seems he just wasn't mature enough about it as a director to give Venom the role he deserves.
And then, as if to give Venom fans the finger, Raimi unnecessarily kills him off. He has Spider-Man pull Brock out of the symbiote, so that it can be destroyed without Brock being killed, so there is still the possibility of Venom returning at the hands of future directors who may actually care about the character. But no. He has Brock jump into the explosion.
A better director would have brought in Venom and done him justice, even if the character didn't appeal to him personally.