I'm not convinced Venom's success has that much to do with the character. I really think that entire franchise is built on Tom Hardy committing and just really, really going for it. Without the boldness of his performance I'm not sure the first film fares any better than the rest of Sony's output. Hardy's ability and willingness to just be weird and sometimes offputting while also being charming and vulnerable kind of carry what are not really great movies.,
Yeah, I find the whole approach to the Venom movies weird, turning them into a buddy comedy rather than a psychological horror and body-horror story. So I agree that whatever success the movies have inexplicably had is more about the performances and actor appeal than anything to do with the intrinsic concept.
All this talk about how much a character can or cannot be the protagonist of a movie on their own I find absolutely inconclusive and even useless. As if there was some kind of curse connected to their essence that affects the finished product.
I'm always bewildered when people argue that a movie can only succeed if it centers on a character who's already famous. If that were so, where would new characters come from in the first place? Every famous character started out obscure. It's a nonsensical argument, and it gets the cause and effect backward. Good movies make their characters popular, even if they never existed before.
The truth is that Sony has simply made movies between mediocre and bad. Even from a purely technical point of view (see Madame Web). Why, I have no idea. There are not many rumors or behind the scenes about it. Maybe it could simply be excessive interference from the studios. These are not seen as movies, but money-making machines like their MCU counterparts. And money makes people crazy.
I've always felt the problem is that studio executives are business people, not creative people, yet they get to tell the creative people how to make their movies. So they have absolute authority over a process they don't understand at all.