I've heard a lot of people complain about how bad aspects of the iPhone are... it was a bold and game changing device, but I don't think a product that has changed minimally since the first version launched should be getting too confident about continued market share.
The iPhone 3G and 3GS are incremental improvements over the earlier models; they don't need to be revolutionary in the hardware—the software is key to most of the iPhone experience.
I hear a lot of people complain about the iPhone, but I wonder how much of those complaints are about the piss-poor U.S. carrier. I've heard no complaints from my circle in Toronto, and I've heard of few complaints in Europe.
My biggest problem is that I can't roam with it for a reasonable price when I go to Europe this summer.
No different screen sizes or shapes to support, few memory or processing speed or peripheral availability changes.
Everything that made developing Java for cellphones horrible, it doesn't have.