I love my iPhone 4 and have been a customer since the original iPhone. I truly believe it was rushed to market before many kinks were worked out. We all hear about some of the big ones (which frankly don’t affect me), but there are other major usability issues that need to be addressed.
My biggest gripe about the iPhone 4 is the ambient light sensor – it doesn’t adjust until after the screen is unlocked. So when I am outside in bright daylight, I cannot look at the screen to see who is calling until I swipe my finger; I can’t even check the time without swiping. This is a huge issue and I am surprised no one really complains about it.
Next, the screen is too sensitive; I have to consciously turn off the device before placing it in my pocket or who knows what will happen.
And yes, the software driving the proximity sensor needs adjustment; I hate it when my conversation changes to my headset while holding it to my face (or a number of other problems).
Finally, I have been noticing that it is more sensitive to bumps in the road while listening to music. If I go over a rough section of road, the iPod app will switch to another song. Good grief!
I believe these are all fixable through software; I hope the next version of iOS4 addresses these issues.