MIXED MEDIA : ** ‘THE PUNK ROCK MOVIE” Directed by Don Letts <i> Rhino videocassette ($19.95)</i> : <i> Works are rated on a scale of one star (poor) to five stars (a classic). : </i>

As artifacts go, this 1977 rockumentary has the real goods--all the names that made England’s punk scene seem so exotic and exciting. Not just the big stars even your mom heard of, like Billy Idol and Johnny Rotten, but PolyCQ Styrene and Gaye Advert too, Alternative TV and the Slits. But what director Letts (later a player himself with Big Audio Dynamite) depicts is a squalid little world of kids goofing off, injecting drugs, slashing themselves and otherwise annoying adults. Without the framing of a social context, it’s just a freak show. Disjointed and incoherent, the barely watchable film even blows its best moments--concert footage of the Clash and the Sex Pistols--with bad sound.