This is a pretty good collection of Interviews with Nabokov and Nabokov's letters to editors and stuff like that. For people who want to find out more there's the comprehensive two volume biography of Nabokov by Brian Boyd.
Nabokov's opinions in a nutshell?
Thought everything written by James Joyce was completely mediocre except for "Ulysses," which towered above the rest of his ouvre as one of the supreme literary masterpieces of the 20th century. Loved Flaubert and Proust and Chateaubriand, did not like Stendhal (simple and full of cliches) or Balzac (full of absurdities). Loved Tolstoy's "Anna Karenina" (considered it the greatest novel of the 19th century) and "Death of Ivan Illych," hated "Resurrection" and "Kreutzer sonata." Liked Gogol, despised Dostoevsky as a melodramatic mystic (he even once gave a student an F in his course for disagreeing with him). Loathed Conrad and Hemingway, but liked the description of the fish in "Old Man and the Sea" and the short story "Killers." Hated Andre Gide, T.S.Eliot, Faulkner, Thomas Mann and D.H.Lawrence and considered them all frauds. Thought Kafka was great, Orwell mediocre. Despised Camus and Sartre, considered Celine a second rater, but liked H.G.Wells. Loved Kubrick's film of Lolita (thought it was absolutely first-rate in every way) but later in the '70s regretted that Sue Lyon (though instantly picked by Nabokov himself along with Kubrick out of a list of thousands) had been too old for the part & suggested that Catherine Demongeot, the boyish looking 11 year old who appeared in Louis Malle's 1960 film "Zazie dans le Metro" would've been just about perfect to induce the right amount of moral repulsion in the audience towards Humbert (and prevent them from enjoying the work on any superficial level other than the purely artistic). Liked avant-garde writers like Borges and Robbe-Grillet and even went out of his way to see Alain Resnais' film with Robbe-Grillet: "Last Year at Marienband." Didn't care for the films of von Sternberg or Fritz Lang, loved Laurel and Hardy. Made a point of saying how much he hated Lenin when it was fashionable to blame the disasters of the Soviet Union on Stalin. Supported the War in Vietnam and sent President Johnson a note saying he appreciated the good job he was doing bombing Vietnam. Never drove an automobile in his life & his wife was the one who drove him through the United States on scientific butterfly-hunting expeditions, all through the many locales & motels & lodges that later appeared in "Lolita."
Seem interesting? You're bound to be offended even if Nabokov is one of your favorite writers. Genius or madman? I would say both, the 'divine madness' of the greatest of artists. Highly recommended for a peek inside the artistically fertile mind, and the tensions that need to be maintained to produce it.