If you think the problem was the character, maybe you should watch any of her other films before you make an overall assessment of her ability as an actor. Perhaps one of the critically acclaimed ones? The one she won an Oscar for?
No, no, I think the film where she is deliberately playing a character with repressed emotions is the real barometer for how much range she is.
In a lot of ways the character is a metaphor. She's a woman being told that she can't show her real emotions and still be taken seriously or viewed as competent, so she's repressing them until the very, very end. It's meant to represent how a lot of women feel, except making that your introduction to a new character and making her come across that way -- really neutral and distant -- for almost the entire runtime was honestly a pretty big miscalculation. I see what they were going for, but I do think it hurt the character in a lot of ways.
I'm excited to see how she feels in Captain Marvel 2.