Fuck yeah!
I agree that vocals is the most important thing (except for the song writing naturally). No instrument is as pure, as touching, as emotional as the human voice. Even if the instrument players lack skill, they can still sound good, but if the vocalist doesn't sound good it turns everything to shit.
Obviously I do believe that every single instrument is very important and a good song could never be reached with just a vocalist. But in the end it's the vocalist who you come in contact with most when hearing a song, he represents everyone in a way, and that's why the vocals are so important (at least for me).