Earlier quoted context omitted.
Chrome, as Google Search (google.com main page), was very well-designed at the start. From there, it only went downhill, as soon as the marketing people interfered.
What are you referring to? If I recall, it hasn't really changed a lot, other than minor things such as replacing the wrench icon with a hot-dog
That's just because they weren't left with a lot of elements that they could change (most of Chrome is really minimal). However, the welcome page/new tab page has gone through some really bad iterations (app store, Google+, search box, ...) that removed most of the minimalism and simplicity.