3.9? That's pretty lame. This was an album that really didn't sit well with me when I first heard it and I believe it took quite a while for me to come around but now I regard it Silverchair's best album. Everything is pretty much great on this. The production is spectacular (one of the best produced rock albums I've probably heard), the instrumentals are really nice and impressive, and the singing is great.
Daniel's singing really stands out on this. He came into his own on this album and completely abandoned his Cobain-isms. He's actually a very good to great singer. The orchestrations really add a lot to this album and I really like how this sounds very positive for a rock album.