Like you said, you wouldn't want to live in Thamesmead; what's the point of residential buildings that nobody would choose to live in? They leak like fuck too, unsurprisingly.
The Pimlico school building is astonishing just for being a hideous paean to poverty in amongst great wealth. You stroll past Tate Britain and the white town houses of Belgrave Rd, past the small, perfectly-kept green squares, then suddenly you see a fifty-foot drop to a place that you're sure must be a moated prison, going on the concrete and the bars and the lack of thought to the idea that anyone's going to see it from the outside. But no, that's where they keep children.
You could laud it for its brave difference, its rebelliousness, I guess, if you were in a contrary state of mind - if it weren't that the building is functionally unsound.
Cold or hot, never in-between; sucks up sounds in its drama departments and transmits sounds everywhere else; prone to insect infestations and floods; butt-ugly; practically no ventilation; sometimes has to be closed in especially hot or cold weather, because it goes beyong legal temperatures - an honour otherwise bestowed only on PFI buildings unless there's an extreme heatwave or cold snap.
All in all, a fine venue for a school that has Performing Arts status in one of the richest areas of the country. A fine place to send the poor kids of the borough while their much richer next-door neighbours run away from the place screaming.
I think that for architects, concrete blocks pose a wonderful challenge, because it's so much harder to construct a happy and functional environment from them. Unfortunately, very few architects were up to the challenge.