I don't hate the new look, but the contrast could definitely be better. One thing to note, is Google's design head for google+ (including the gmail updates) is the guy that's responsible for a /lot/ of iOS and OSX's design aesthetic. He and the head of google+ are also working more like dictators, basically decreeing how things will be, which is not how google has worked in the past. So things are basically different, because things are different. There's actually some kind of over-arching long term goal here that we won't see for probably years. In the mean time, we get updates peace-meal, some of which no doubt, a large portion of people won't be happy with.