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On the other hand, while it is hard to judge a book by it's cover, it's not so crazy to judge it from a few paragraphs: if it's a funny book, you can usually tell right away if it's your genre of irony, and if it's fantasy you can see easily if it's all smeerps and naked heroins dressed in leather and so on.
Some things do grow on you during reading, but if you can't stand a pompous verbose style (or a crude bare one) you can avoid starting reading something you won't ever even finish.
But, obviously, all of this is IMO.