Regarding the Chrome user interface, it's a browser window with a place for tabs and a url bar and a forward/back button. Also, user interfaces are like brands, You open Google Chrome and it looks like Google Chrome on Windows as it does Mac and Linux. They've gone out of the way to make sure people can use their product across a spectrum of devices and computers. I would say Firefox is the weirdest, it took some elements of OS X and added them with their own UI in a hosh posh mess. Their "custom app system preferences" are identical to it on Windows, and Chrome's download window is hands down far better than Safari's download manager.
The problem is that OS X has a crap load of standard APIs to do all that stuff and Windows doesn't, thus everything on Windows has to be programmed from scratch or using 3rd-party libraries.
We don't want the same apps to be standard across different platforms, we want different apps to be standard across a single platform. Or else, why the need of having different platforms ? That whole OS X vs Windows vs Linux debate wouldn't make sense anymore.
As a Developer, I can tell you that designing standard things in OS X such as Print Menus, Preference Panes, Buttons, PDF Reader, etc. are way easier to work with both for the developer and for the user, let alone the possibility of having bugs and security issues when working with 3rd-party APIs.
I maintain that Chrome on OS X is complete trash.