Every feature on the iPhone is rigurously integrated, so though it has fewer functions than the n900, the functions it has are generally more reliable IMO

Ultimately, Jo Schmo doesn't care that about processor speed, IR, or maybe even multitasking... Just that the advertised features of the phone work smoothly or not.

The n900 is (was) a bleeding edge device, naturally some features were unstable, but nonetheless people have bought the device to use these features or have become reliant on them, and then are let down when they don't work as expected.

IMO this is why no one complains about the iPhone, though ultimately I think many people do and they just stay away from culty fanboi forums!