While I love me some Hayley, I do agree with everyone that she's not the only important part of Paramore. Josh writes some amazing music... I wish I could've written some of the stuff he has; Zac is one of the most aggressive and talented drummers I've heard in a few years; and Jeremy is one of my favorite bass players... listen to his bass lines some time, they're sick!
I do also agree with Jorgi, though, that it wouldn't matter whether Hayley was a girl or a guy, the singer and frontwoman/man always gets the most attention in any band. When I was younger, the reason I learned to play all the instruments I did and not take voice lessons was because I didn't want to be the singer in a band and get all that attention.
However, the guys bring a lot to the table too and more people need to realise and acknowledge that.