Absolutely GitHub is so mediocre. It's fine for most open source project workflows, but when I worked for a company that used it as their main tool I was blown away how badly it managed professional-level code reviews.

Gerrit isn't beautiful, and it also had a lot of knobs that could be tweaked in weird ways. But I do miss aspects of it.

I have been wanting to check out JetBrain's code review tool and see how it looks.