Quoted from Rando:
I don't get the love for Phasma, was she a major player in the EU or something? The buildup to her pre Ep 7 was big, then she was lame. The build up for her pre Ep 8 was big, and she had more or a role, but again lame. I don't think it's Disney that's really pushing her though, it's seems to be fans, and I can't figure out why.
In my opinion, she's a minor character, nothing really of interest, so I don't pay attention to her. Like one of the minor Empire Captains. Maybe some screen time and a line or two, but not a major player.
But in articles and here people are excited about her and upset she wasn't more. Is it's because she's silver? Is it because she's a she? I don't get it.
You're not wrong, Phasma has like three lines of dialog and is a forgettable character. People got hyped about her for one reason and one reason only, which is that she's silver. But Di$ney probably sold several million dollars worth of toys because people were psyched about a storm trooper with a color scheme other than black and white.