They claim this is a feature, not a bug. It means that range will never block or do weird stuff. Except of course when it does (bastard question for those who think they know : what does range do on a nil channel ?)
Despite all these clarity claims, go has significant pitfalls, like the nil channel above (and you will enounter nil channels). There's other things, like "what is a pointer in Go", if your answer involves "*", I urge you to reconsider (hint : what's the difference between []int and [5]int ? Is one of them a pointer ? What about channels (of course I talked about nil channels) ? Maps ?
But every type can be typedeffed to a pointer type of itself, like in Pascal (lots of things look like pascal), and result in completely unpredictable reference or value semantics (or my favorite : partial reference semantics).
Does go have generics ? YES (make, range, ...). Go has something no other language has : return type generic function types (meaning a functions meaning changes depending on what you assign the result to, like range). Does Go have operator overloading ? Is Go object oriented ? YES (including single inheritance). YES. Does go have (complicated language feature X) ? Probably yes. But all of these features are only accessible to Rob Pike, who has apparently decided that nobody has any use for any kind of tree or graph data structures, matrices, complex numbers, or so.
In practice you can catch the go team themselves in errors on the language semantics in their presentations, so I think a VERY strong case can be made that it's not at all that obvious.
But the truth is : this language, due to politics (high position of it's inventor) has 10 or so FTE behind it, with lots of paid people contributing various small bits. Is it anything more than some guys idea of his own favorite programming language ?
The honest answer is simply : no.
The only real advantage Go has is a small, yet functional and pretty complete standard library (like C++ had in the 1980s). It is an advantage that will fade, just like it's faded for every other language.