And not only just an author. IMHO the very best SciFi author all time, and polled as the 2nd best of the golden age (pre-Lem/Strugatsky's/Dick and the modern 99

And not only just an author. IMHO the very best SciFi author all time, and polled as the 2nd best of the golden age (pre-Lem/Strugatsky's/Dick and the modern 99.9% crap). He also wrote the preface to the Strugatsky's famous "Roadside Picnic" (known as Stalker). Hence his 90% crap rule comes from a different mouth than just from a critic.