I don't mind the ability to open an app in a tab instead of an app tray. Beyond that the security sandbox (or the perceived one) I'm a big fan of. I like a clean desktop and I put all of my data on servers so I can access my stuff from just about anywhere. But then optimization be damned we need to move fast and push features. Wow now I need 6gb of memory just to open 4 tabs. Wow now we need browsers to unload tabs to conserve memory. Wow apps used to run under 1mb with a GUI. Wow I can launch a single threaded C app with less than 1mb committed including mapped libraries.