why don't people like arwen in the movie?

[Sindae]

I don't think that it was a good idea to let Arwen take Glorfindel's place. Arwen is not Éowyn, she's no warrior! Perhaps she's very wise and so on but not that action type who'd fight against Nazgûl. The love scene in Rivendell was not bad and explains much but the meeting with the fellowship before this was unnecessary and against her character.