Even the iPhone’s implementation of its standard gestural interactions is inconsistent. This is most frustrating on simple interactions like tap. There are obvious tap targets like buttons and non-obvious targets like received calls, tweets, emails, etc. In some cases, a tap on a non-obvious target means “open” or “get detailed info.” But in others it means “take action.” The worst example of this is the Recent Calls list. I can’t tell you how many times I’ve accidentally called someone when what I wanted to do was get more details about the call. Yes there is an arrow button, but it’s on the right side away from my focus. Other applications (like Mail) have trained me to tap an object to get a detailed view of it, so my natural tendency is to tap the contact name or number.

https://web.archive.org/web/20090821172750/http://johnnyholland.org/magazine/2009/08/the-iphone-is-not-easy-to-use-a-peek-into-the-future-of-experience-design/

I guess we will get used to it and the user experience will improve over time. Look at kids using an iPhone… they get it quick.