Given the option, I would have rated this at least 6 stars, despite the last track being something of a disappointment (we'll come back to that...)
First off, this 35 years old album still sounds utterly contemporary. So much wouldn't have happened without it, and none of the innumerable bands influenced by it have come close to equalling it.
Second, let's dispel the notion that this is a bunch of spontaneous stuff they just came up with in the studio. What it IS is their live set of the time, honed by regular gigs and (superbly) recorded live in the studio through a p.a. with no overdubs. Anyone who's heard the sadly no longer available "Complete Funhouse Sessions" will know that they arrived in the studio with these songs pretty much already worked out, and the multiple takes (over 30 on some songs) were just a case of nailing the best possible version. These guys weren't virtuosi, but they could lay down a murderous groove to rival anyone - and as for the singer...
Down In The Street is a mean, lowdown, almost funky opener, with some superb whoops and yells from Iggy. Loose (which took the most takes) is an awesome full on floor the accelerator three chord blast, with some great dynamics. TV Eye keeps up the energy level with a bit more structure. Absolutely superb, especially the bit where Ron Asheton just chugs away on guitar with Iggy's unearthly yowling over the top. And then possibly the greatest thing they ever recorded - Dirt. This is an epic ballad, alternating between a vicious, jerking riff and an almost plaintive section, with a cool guitar solo thrown in and Iggy snarling "do you feel it when you cut me?" with terrifying conviction.
The second half is patchier - opener 1970 is probably the least good actual song on here (still damn fine though), but also marks the debut of excellent sax player Steve Mackay, who plays throughout the rest of the album. The title track is a vicious and extended workout showing clear evidence Iggy had been listening to James Brown, though by no means trying to copy proper funk. It seethes with superb vocals and sax. Check out the 2 CD version for some great out-takes of this. Lastly, we get to LA Blues. Unfortunately the producer wouldn't let them do what they did live, which was break down into LA Blues from the end of Fun House, after building up a full head of steam. Instead, they had to start it cold, and it shows - you really have to be in the mood to make a free-form freakout like this work, and they weren't, especially drummer Scott Asheton - he had to overdub a new drum part over the edit (from a 17 minute jam) used for the album - which was never going to yield ideal results.
So five and a half good tracks out of seven, on a 33 minute album - doesn't sound that hot. But be assured that those five and half tracks are at the absolute pinnacle of loud, vicious, evil, dirty (fill in more adjectives when you've heard it) rock music. Just doesn't get any better than this.