I very much like Go's approach to static typing. Go allowed me to retain the flexibility and ease of development that Ruby and friends provide, even though the output is fully statically typed. It's great!
My personal one is how fast it compiles, given I was doing the same thing with Modula-2 and Turbo Pascal in the mid-80's.
There is a reason why no one wants to use Java 1.4 anymore.
Go's "static typing" is next to useless.