Great movie.
A thing to not under value is the director's use of characters. It's super difficult to give everybody screen time and make each one relevant, but he did it so smoothly that most will probably not even realize it.
Spader voice was not only not bad, it was perhaps perfect
I fucking love Black Panther so I squeed a little
Ultron's doomsday plan was stupid and it was a waste of his core competencies. This seems to be a common trend, the bad guy falls flat. It's like the creators run out of steam and just want it to get over with. That's why I think there should be more villain focused movies to get their screen times in also.
My favorite Ultron scenes dealt with him narrating his thoughts, like when he first became self aware, and when he tapped into things simply using his 'mind'
His mouth animations were slightly distracting
The very beginning was a bit disorienting, where they throw us into it without giving the audience a sense of place or purpose, forcing us to look within to find matching references instead of just watching. A few scenes in they back pedal and tell us what they're doing. They should have lead with that