The plot was actually decent, well suited to the shadowy world that was established by previous Captain America films.Sam embodied the titular character in spirit but relies heavily on his tech just to survive. Sam is NOT a super soldier. There were a couple cameos and nods but nothing earth shattering. I'm not an expert but have seen enough movies to know bad green screen, CGI and rough reshoots and it showed here.
I'm trying not to be harsh. Let's just say it was OK and best I can give is a B+