I wouldn't say it's exactly brilliant - but it's just missing all the really cool stuff, rather than being buggy. It does what it's trying to do, and then stops. It's a bit like C in that regard (and unlike C++, Java, and C#, which tried to do something much bigger and didn't get it right).

It's also a bit like working with first-order propositional logic - well-founded and with its own unique simplicity, but you can't say everything with it and have alternatives.

So yes, I'd say that the type system of Go doesn't suck. It's not very good, and there are so many better things out there (rust, I'm looking at you), but it's a long way from being a disaster.