To me, that's just the case for camera and calendar. Maps is IMHO perfect (except the unnecessary G) and the red-and-white envelope is quite well-known.
I think what really bothers me about the aesthetics is that the shapes are broken up by the coloration. For example, the pin icon for Google Maps looks almost like a hook, because the yellow has little contrast on this white background.
And that’s why I don’t really hate it. I hate Google, but I think it’s a neat design choice. I still hate Microsoft’s icon design a lot though, they can’t seem to stick with one thing.