A front facing camera allows video chatting. That's the main selling point for them.
It's one of the key marketing features for the iPhone 4/4S. We know that
Microsoft is working on expanding WP7 into the video chat arena and
the Titan, amongst other phones, will implement it. They also own, you know,
Skype, whose major appeal is that it can do video chat. It also allows face unlock
which is one of the key marketing features for the Galaxy Nexus.
But sure, who values that, besides all the vastly more successful competitors and Microsoft themselves?
RE you performance comparison, people value high performance in their devices. A smooth interface, enough RAM to allow them to complete tasks that they want to complete, and the necessary power to do elaborate applications. The actual numbers are relatively unimportant. Android phones began to, on paper, beat the iPhone a long time ago. And yet on all but the highest end phones, in most use cases, the iPhone actual performs better. Hell, WP7 is a testament to this. WP7 gen 1 phones perform very well, the OS is super smooth and fast, and yet their innards are old and busted.