I actually thought Hawkeye was a bit of a weak moment.
Don't get me wrong, I love the film and love the idea
of getting Hawkeye in there. But it was so awkwardly integrated, it was so incredibly obvious his shots were after the fact inserts, and his dialogue was so removed from what the other characters were doing. It screamed "give Hawkeye something cool to say" without first thinking whether they had Coulson reaction shots that were appropriate. And the insert of the reach for the rifle, then the mind change to the bow...ugh. So awkward. It was pretty obvious to me that Branagh had nothing to do with those shots.
Just a minor annoyance in an otherwise great film, though.