Okay I felt it was about time I spoke my mind. So here are all my concerns for Age of Ultron.
1. I'm NOT a Joss Whedon fan. Like at all. The Avengers and Firefly are the exceptions and are actually enjoyable to me but I can't like anything else the man has made. He's a complete jerk in real-life (he called Empire Strikes Back not a good sequel) and he's a terrible director. As much as I love Avengers, there are times where it's framed and shot like a TV show and I do have quams with it. He just seems like the wrong guy to do the sequel. I'm also worried because he said Age of Ultron will be darker then the first and someone important might die. Joss Whedon and dark don't go well together and he has this annoying cliche of killing off characters at random.
2. Okay, I did research on Ultron. He's not my favorite Marvel villain but he's a decent one. And that works...for a comic book. But some things don't look as good on a movie as they do in a comic. For example, as much as I loved Brainiac in the Superman: The Animated Series, I admit that seeing him fight Superman in the live-action film would look rather silly. Same for Ultron. I also can't picture, no matter how hard I try, the Avengers fighting a computer with a god-complex. It feels like such a downgrade. He also reminds me too much of HAL-900. Look if I wanted to watch people fight a robot, I'd watch Terminator. Also I hate villains who are too powerful. They might make him too powerful.
3. I have this perpetual fear that Joss Whedon's man-crush on Robert Downey Jr will get in the way and he'll give Tony Stark more screentime then anyone else. If there was one thing that annoyed me more then anything in The Avengers, it was that Tony Stark was on screen WAY TOO MUCH. I like Tony Stark and Robert Downey Jr's portrayal of him, but he was meh in Iron Man 3 and I'm worried also that Joss will jump the shark and make Tony Stark the creator of Ultron. NOT EVERYTHING IN THE AVENGERS MUST REVOLVE AROUND TONY.
4. I also don't want Joss Whedon to make the government this big bad. A thing that irritated me in Firefly was that the Alliance was this big bad instead of just a government being a government.
5. Probably the biggest problem I have, and this is my sister's biggest complaint too, is that Pietro and Wanda Maximoff are in the film. That's not necessarily bad: I like the actor's they got to play them (Aaron Taylor-Johnson and Elizabeth Olsen) and I would love to see them on screen. But Joss forgot one tiny little detail...THEY'RE MAGNETO'S CHILDREN. He announced recently he came up with this cookie-cutter backstory of their parents dying and them growing up in a slum. That's not bad but I'm sorry if you're not going to have that juicy father-children conflict with them and Magneto which was one of the best things about them, why even have them if all we're gonna get is emo-daddy issues with the Avengers? It's like Joss wanted to get back at Fox for not letting him do X-Men. Let it go dude. You had a chance, you lost it, you move on. Also...EXPLAIN THEIR POWERS. I'm worried Joss Whedon won't have an explanation for their powers and just have it be "They have powers. Don't question it."
6. No offense but I actually hated the loss of realism with the Extremis virus in Iron Man 3. Phase 1 and The Avengers treated this universe with as much realism as possible making sure to be a superhero film but not go over the deep end. But then came in the horrible mistake of Iron Man 3 and it feels like Extremis was added just because "it exists in the comic, so put it in even if it looks stupid on screen and makes no sense." Adding Ultron just adds insult to injury.
Those are my complaints and while I still have a glimmer of hope for Age of Ultron, but i'm more interested in The Hobbit and X-Men: Days of Future Past because at least with Days of Future Past it looks like their actually trying to make a good X-Men film (even though the use of digital film for the 1970's sequences was a major mistep).
Anyway here's hoping. Feel free to comment but be kind.