I just posted this in the 18.3 thread, but I'm going to put it here too.
I'm going to go against the trend and say that I don't like the updates to the media interface. The biggest annoyance is that the media window doesn't stay maximized when selecting a streaming station. It goes back to the completely minimized state after each time a new station is tapped. I liked being able to tap on random stations in the media player to browse them and now instead of being able to stay on the maximized screen to do that, you have to re-maximize the media player every time. This is much worse than the previous interface.
I don't like the new way that sources are selected on the maximized interface either. Having the separate button to make sources selectable from the the minimized player is fine, but on the maximized window, there's no need for it. Instead of keeping them in tabs on the to get to each source quickly, it adds an unnecessary tap to bring up the sub-menu every time.