I'm surprised Hulk fans just want Hulk. They should know that the man is as important as the other self.
You just answered your own question. Hulk fans want more Hulk because the "other self" (you can't even say it?) is just as important as the man. It
does work both ways. If we are going to claim it can't be done....don't bother with the character. You're just going to end up with a product that the public yawns at as we've seen so far.
We are going to keep saying "they are equally important" and then argue that the movies should keep ignoring the Hulk character in favor of letting Banner dominate the entire story (again)?
Don't count on it. This is a film, not a comic, where drawing a big green creature is limitless without even a budget. They chose an actor to play him for a reason. Why do you think they're saying all this stuff about Banner? He's not gonna just be in this for five minutes and the rest of the time Hulk is gonna be in it talking and having a compete characterization. Not enough money for that. Especially having to develop three other heroes.
Maybe that's why you save money on the actor.
Budgets:
TIH-150 million
Hulk-137 million
Lord of the Rings -281 million (3 movies 94 million average)
Someone is overspending. LOTR managed to have a fully developed CGI character that was fully capable of speech and was probably the most popular character in the films....for
way less than the money that was spent on the "run in a smash stuff and run away so Banner can get back onscreen so our big name actor can get his screentime".
I think Hulk talking in full speech and dialogue to the Avengers would be hokey. It would sound like Krunk in your avatar. Or just hear how he spoke in the former films. Imagine him talking like that in full sentences. I prefer him to say fewer words. You can do more with him with less to say I think. Hulk is already a symbol of going too far in nature and the punishment that Banner endures for going too far. It's really a manifistation of Banner and his anger but symbolized as a green creature. Hulk is smart of course and he's not just some dumb animal and he's just as important as is Banner. But I just think him talking in full sentences with the voice he has now would be silly.
I always wonder how anyone knows this.
It's never been tried.
What
has been tried? We've seen Peter Jackson do it
very successfully with a CGI character. Yes...he talked funny. No...the audience didn't have any problem with it. (Something called "good writing" takes care of that) He was rendered about as well as the Hulk in Ang Lee's movie...but audiences didn't complain about how he looked. (Hint: Because Gollum was a real character in the films...not just a special effect)
What else has been tried? We've had a TV show that should have been named "The Incredible Banner" and two movies that turned the Hulk character into a special guest in his own movies without the power to communicate his feelings or with any real interaction with his co-stars. Audiences, left nothing else to do in relation to the character, talked about how he looked and many jokes were made about that. Both the movies and the TV show were not very successful with the general public. Not complete failures, but nothing about them would sustain a franchise. So
we know this approach isn't working.
Two clear paths appear. Keep doing what has not worked or try something different. Find a way to present the Hulk character onscreen for the first time ever and at least give him a chance. The audience just might like him as much as Gollum.
If you can't put the Hulk character onscreen...stop wasting your time with Bruce Banner movies. The general public is yawning at those.