[iLemming]

No, you cannot realistically learn Haskell in two weeks and jump into industrial Haskell codebase. I mean, it is not impossible - I just never heard such stories. If that was as easy as you think it is - Haskell would be much, much more popular. It is an amazing language. And probably the only point of criticism you can think of is exactly that: it takes quite some dedication and time to grok it.