When people point to examples of bad brutalist architecture, I point them to the Barbican as a beautiful counter-example.
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The rule is the rule, and exceptions are the exception. Exceptions do not make the rule, by definition, so if your only defense of Brutalism is to say 'look at this one exception out of the tens of thousands that got built, which doesn't suck!', then you have conceded the point about Brutalism sucking.