The base iPhone is adequate. It does most things well and good enough for most people, but it gets overshadowed by the overkill of the Pro models capabilities and premium perception. Most people want the best, even if they don't need the best. Then comes the Air, its exciting new form factor is a breath of fresh air (pun intended) in a stale lineup. So, while I do believe the base iPhone is slept on, especially last two years, I think it just doesn't stand out enough.