No, this is not normal.  This is a shocking electoral upset of epic proportions that is unprecedented in modern Japan.

What is different from three years ago is that the LDP has suffered from several years of visible, public, and easily recognized confusion and disarray, at least since Koizumi stepped down, and the first period of something approaching economic prosperity came to a quick, cruel, and recent end - and the LDP has had no coherent response.

Will anything actually change?  Who knows.