At the time, the book seemed like a fresh breath of air, since it focused on solving real 'daily work'-style problems in Haskell. I used to recommend it to friends, but most of them were not so happy. The first few chapters are nice, but after that the examples really become contrived. Instead of giving simple standalone examples to explain a concept, the book starts using examples that tend to linger. People get bored or stuck and stop around chapter 6 to 8.
I am hopeful that Learn You a Haskell will serve as a good introduction to Haskell, and will recommend it to anyone interested.
RWH is still a fine book; once you understand Haskell, it's still great to go through the examples and exercises. But it is not a good starting point.