Check out jinjing's code: http://github.com/nfjinjing/loli/tree/master Yes, it's still experimental. But it opens your eyes a bit.
Haskell itself is certainly cooked enough. People who don't trust Java use Haskell (see http://www.galois.com) when they need to protect the Government's data.
But Haskell's web frameworks leave something to be desired. So it may not be the most productive environment at the moment. But ... if you master it, untold power will be yours :)
