Sound — 8
Everyone knows that Led Zeppelin is one of, if not the, greatest band of all time. Non-withstanding what I just said, they have put out some works that were less apealing than others. This, along with Led Zeppelin III, is one of them. I had owned every other Led Zeppelin album before this and was wowed by each of them (not so much III, but it's not that bad), and they are all better than this. The only problem with saying this album sucks is that it doesn't. It's just not up to the quality of the other albums.
Lyrics — 10
The greatest thing about this album is that it has some great lyrics and Robert Plant's vocals are just as perfectly shrill as ever. Ther's not really much else I can say except that if you really the lyrical portion of Led Zeppelin's music (I assume you don't have Led Zeppelin I or II), this album's for you.
Overall Impression — 6
It should be noted that this album is heavily reliant on the lyrics rather than instrumental music. This really disappoints me because when I buy a Led Zeppelin album, I expect to have to work all night long trying to learn every riff to every song, but this just doesn't inspire me to even try. If you really want the best Zeppelin album, look elsewhere (like IV or Physical Grafitti). It this was lost or stolen, I don't think I would buy it again.