People who read manga...?

I never do like those kind of manga. The plot isn't very original. I mean the main girl is always like that. Only difference: their appearance. But everything else, they're usually always the same. It gets so boring. And even the so-called 'strong' (and/or strong-willed) girls, aren't even that strong. If they were so 'stong' or confident or whatever, how come their all so weak? It's pretty degrading...