It is linked from the main page to answer the question "What is Haskell?" It is not supposed to an example driven page at all. The title of the wiki page could be changed to fix this though. The very next link is http://tryhaskell.org/ to learn Haskell in a example driven way.
Evaluating a language by just reading the introduction is like reading the introduction of a book and saying that you didn't like it. Read it! :)
It seems we are focusing too much in a possible weak point and forgeting about several strong points Haskell has.