This blog post is just one example of those kinds of issues, and it's just the most recent of such that I've read: https://fasterthanli.me/articles/i-want-off-mr-golangs-wild-...
Things like no package management, no vendoring, importing modules directly from GitHub without any concept of versioning, the confusing mess that is $GOPATH, the awkward handling of errors, and so on. Lots of things that were fixed, but shouldn't have been broken in the first place.
Go certainly has use and functionality and benefits (goroutines sound awesome), but Go itself seems like kind of an awkward mess when viewed outside of the context of "internal Google tool".