The thing that I really like (besides the Metro interface) compared to iOS is the integration of Twitter, Facebook, LinkedIn et al in the People hub. It actually gives me more information density than the iPhone, where I have to switch between various applications to see what happened. If I want to zoom in to specific persons or groups, I just make a tile to get a subset of that information (e.g. I have a 'Family' tile for my parents, brother, etc.). Also, it comes with a lot of functionality out of the box, such as a lightweight versions of Office and OneNote, Skydrive integration, XBox Music Pass support (Spotify with a far larger catalogue), etc.
It's true that the number and breadth of applications is relatively small, but the Windows Phone OS is fairly complete, and most applications that I require are available (Whatsapp, Skype, etc.).
Between the apps and UI style it almost just feels to me more like a glorified feature phone.
To be honest, that's a bit troll-ish, given that WP8 uses the same kernel and user interface as Windows 8 and given the functionality of the pre-installed applications.