Let's see, based on App store ratings..Photos 4.5 starsMaps 4.5 starsGmail 4.5 starsChrome 3 starsDocs/Drive 4.5 starsHangouts 4.5 starsInbox 4 starsPlay Music 3.5 starsSearch 3.5 starsYouTube 2.5 stars Overall "crap" they are not.
I was at the local t-mobile store yesterday (looking for a new phone for the wife) and they had the S6 with the curved edges. The screen was just beautiful by far the best of any other devices in the store.
Downloaded it last night. Meh, nowhere near as good as Google/Apple offerings. It would not show me alternate routes to my destination (200 miles away) even though I know there is at least one viable alternate. UI is not very clever, you have to hunt around to figure out how to use it. I'll keep it installed as a backup for when I'm in Europe. It certainly won't be my go to navi app.