Are these the 2 biggest problems with the iphone 5?

1.it's too small
2.you'll get lost if you rely on the iphone 5's navigation

Not entirely. See, though the iPhone 5 is "glamorous", it has more problems than that. If you download too many apps, the phone will become slow. There also isn't that many cases for the phone out, yet (well, not as many as the iPhone 4/4s), so you won't be able to protect it well. The iPhone 5 isn't perfect. It also heats up a lot. Hope this helps!