The Avengers' reactions would be diverse. Vision himself, if he were to react, might be confused by some of the more far - fetched plotlines in the fanfiction. Wanda Maximoff could be flattered or perhaps a bit offended depending on how she is depicted. Other Avengers like Rhodey would likely approach it with a sense of amusement. He would see it as a form of entertainment that fans create, not taking it too seriously but still enjoying the creativity that goes into writing such fanfiction.
Also, it's a way for fans to explore different scenarios that were not shown in the official Marvel content. The official shows and movies have a set storyline, but in fanfics, the possibilities are endless. In 'Avengers watch WandaVision' fanfics, the Avengers could end up in WandaVision's world themselves, or they could try to stop Wanda from creating the hex in a completely different way than in the show, which makes these fanfics very exciting and popular.
Well, Tony might be intrigued by the new take on Wanda's powers shown in the trailer. He'd probably start making theories about how her reality - bending could be either a great asset or a huge threat. Steve, on the other hand, would be more concerned about Wanda's mental state. He'd remember how she lost Vision and wonder if this new 'WandaVision' world she's in is a way of her coping or something more sinister.
Tony Stark's flamboyant and curious personality would make him eager to explore the fanfiction. He'd be interested in the new ideas and concepts it presents. Steve Rogers' more traditional and moral - centered personality might make him a bit critical of any fanfiction that goes against the Avengers' values. Thor, with his fun - loving nature, would probably embrace the fanfiction wholeheartedly.
It can also be frustrating at times. Some fanfictions lack the proper understanding of the movie's lore. They might introduce concepts that don't fit well with the established Marvel Cinematic Universe. But on the positive side, many fanfictions are a labor of love. Authors pour their passion for the movie into their writing, and that can really shine through, especially when they capture the essence of the characters as we know them from the movie.
Well, one reaction could be excitement. Fanfictions often explore different aspects of the characters and storylines that might not have been fully delved into in the movie. For example, they might focus on the relationships between the Avengers in more depth, like the budding romance between Black Widow and Hulk. It can be really interesting to see how different authors interpret the characters' emotions and motives.
Often, in fanfiction, it can bring them closer. They might start to understand Wanda better through watching her world in WandaVision. For example, Natasha Romanoff could see a side of Wanda that she hadn't before, a more vulnerable side, and it could strengthen their bond as female Avengers.
There's also a series on Archive of Our Own called 'When the Avengers Watch WandaVision'. This fanfic not only shows their reactions but also delves into how each Avenger's past experiences color their perception of what's going on in Wanda's sitcom world. For example, Vision's past relationship with Wanda adds an extra layer of complexity to his 'viewing' experience in the fanfic.
In this fanfiction, some Avengers might be in shock. For example, Captain America could be deeply saddened, his belief in justice and protecting the world shaken. He might feel a sense of failure for not being able to prevent the Snap.