One thing I can't stand with Ubuntu is the panel position at the top. 90% of users will be browsing the web. If I'm on reddit for example, I will literally have at minimum 3 browser bars (tabs, toolbar, reddit enhancement suite) but also the panel. Consider we read top to bottom, the panel shouldn't be at top since it is almost never being used or read. It should default to the bottom but at the very least you should have the option to move it where you want without having to install a 3rd party extension.