I'm completely neutral. They've changed their UI many times over the years and this is no different. Products usually change UI and that's just a fact of life.
Most of the time it isn't bad UI but a vocal minority that just hates any change.
It's not like these companies release these changes without doing significant user testing and AB testing. If you design based on the opinions of HN/Twitter, every site would look like Craigslist (or HN's favorite abomination of a design, the Berkshire Hathaway site).
