Why would you move from Haskell to Go? There's a night-and-day difference between them. I don't understand why you'd switch to a language because of the features it's lacking, unless you think those features are a bad thing (and I have yet to see a reason why generics and TCO are a bad thing).
Of course they are not a bad thing. It's just that Go has character. It doesn't have generics or C++-style classes just because every other language has them. I respect that.
Go has C++-style classes. Anonymous fields are just C++ multiple inheritance with a different name (and without virtual functions or downcasts).
Technically, it looks good to me. The toolchain is excellent. It looks ready for production. Programming in it is fun. It fixes most issues of compiled languages. Go has mostly replaced Haskell, for me.