That maintenance doesn't happen often enough to really annoy me, not usually anyway (from an AUS player). I'd prefer it if they had a test server up like Blizzard does, instead of having to hotfix the hotfix that hotfixed a different hotfix, you can do that on the public test servers and instead just push one hotfix. No idea why they haven't done this yet, many things such as class balance issues could have been avoided. I guess they don't want to have their content spoiled beforehand.