The first barrier that stop a user from using a service is its log screen. User have to invest time and give his credentials to sign up without the guarantee he will like the service.
In order to encourage user to register, Pinterest landing page give a taste of what he will discover if he sign up. log screen offer an animated blurred preview of the service.
Every time I use the iPhone Google Maps app, something pisses me off. In my opinion they keep making it worse and more difficult to use/figure out. For example, I don’t want to see just one result for my search I want to see ALL of them because you are USUALLY WRONG, Google. Also it usually gives me the wrong directions or makes me go a weird way when i could have just turned left.
In the item view, there is a heart icon for you to add the product to your favorites. But the only clickable spot is the circle button, which is quite small. If you happen to press slightly outside of that circle you will be clicking the photo instead and it takes you to the photos view. This happens to me all the time so then I have to touch the back button and then try again, usually failing many times.
What they should do is make the whole square corner area around the icon a button: