The problem I have with Haskell for getting anything actually done is that nothing I try to do actually works. I mean in the basic "try out the tutorial to learn the thing and be able to get to the end without an error I don't have enough experience to debug" sense. Stack should help with this, but it doesn't when the versions you get (and function signatures of those versions) have changed since the docs were written. Cloud Haskell is an example of this: the tutorial docs are incomplete (the very first command they have you write is wrong, among other things), and they don't specify a stack version so the Hello World example doesn't build with the current snapshot and there's a really odd change to a public API I just can't get my head round.

I've had the same experience with Yesod and Scotty too, although not recently - every time I decide it's been long enough for the ecosystem to mature a bit more, I bounce off issues like this which I just don't get elsewhere, and decide to give it another couple of years.