While on OS X you can replace everything easily to craft the experience you need, on iOS, it's not as much of an option, sadly.
Also, I don't really like Google's desktop offerings - or the lack of them - everything is a webapp, and they just don't work as well as proper desktop software would have. I am so annoyed by the random reloads Chrome apps do, and the utter disrespect they have for multiple desktops.
The most frustrating part for me is that CMD-Tab'ing to, say, Hangouts will show me the Hangouts window. Now if I try to CMD-Tab to Chrome, it stays on the Hangouts window even though they are trying to treat them as separate applications (it's own application icon in the CMD-Tab bar, and a separate application menu from Chrome). This frustrates me on a daily basis.
But Hangouts injects its own icon in the CMD-Tab bar and the Dock. I feel like it this really shouldn't happen unless the app can truly be treated separately or else things start breaking or behaving in ways that the user does not expect ("it doesn't work like everything else" as does in this case).
Also, I don't really like Google's desktop offerings - or the lack of them - everything is a webapp, and they just don't work as well as proper desktop software would have. I am so annoyed by the random reloads Chrome apps do, and the utter disrespect they have for multiple desktops.