Brunner was ahead of his time, in more senses than one.
Many of his favoured themes, such as the denuding of the Earth's resources and the hardship humanity would suffer as a result, were present in his 'lessser' works, eg
The Dreaming Earth (1963) and
The Long Result (1965) -- both excellent in their own right -- but it was in his 'dystopian quartet' that these themes really crystalised. The three already mentioned, plus
The Shockwave Rider, form a wonderful, fascinating, deeply enjoyable and darkly prophetic canon of work for which Brunner is justly remembered.
Of these, the first
-- Stand on Zanzibar -- is arguably the best. A convoluted and quite magnificent work... Discuss? Where to begin?
The other sense in which Brunner was ahead of his time was that
Stand, from his point of view, was four or five years too early. Brunner made very little money from this, his 'masterpiece'. Had it been published to such acclaim at the end of the 60s rather in the middle, he would have earned very nicely from it.
I never had the 'pleasure' of meeting John Brunner (knowing him was not always the easiest thing, by all accounts), which is something I deeply regret. Fortunately, I have a couple of friends who knew him well and so often hear anecdotes of the man.
Brunner was quite simply one of the greatest SF authors the UK ever produced.