** 1/2 BAD RELIGION, “The Gray Race”, Atlantic

Great punk rock has always relied on extremes--musically, lyrically, emotionally--whether it was the scathing invective of the Sex Pistols, Fugazi’s ardent politics or the fierce sonic assault of hard-core. For nearly 15 years and nine albums now, Bad Religion has railed against the inequities of society, and while they’re a formidable musical force, the anger is beginning to seem a bit tired.

Social/political rants such as “Empty Causes” and “Us & Them” have become a stock theme, and though “Punk Rock Song,” like Nirvana’s “Smells Like Teen Spirit,” is a commentary on the commercial conquest of punk rock, it lacks the sardonic sting that gave “Teen Spirit” its edge. The dense harmonies that added color to the L.A. band’s previous efforts seem stiff and mechanical here, and the quintet’s powerful playing frequently overpowers the tunes.

The most engaging moments occur when they loosen up a bit and allow the songs some breathing room, as in “Streets of America” and “Drunk Sincerity,” in which solo guitar snippets cut against the grain and let in some fresh air.