I don't think I know enough about Russian literature to properly get this book, but it did have some great moments. One in particular that I'm often reminded of whenever people on either side of the religion/skepticism debate start saying that things are "obvious". A character is in the middle of an atheist rant. "There's no God!" he exclaims. "It's as obvious as the fact that it's raining right now!" Then Nabokov's camera moves back, and you see that the person upstairs has in fact been watering the flowers on his balcony.
I loved this scene, but I'd be very wary about interpreting it to mean that Nabokov was religious. Just like the non-existence of God: it may be true, but it's not obvious