Mail? Seriously?

I'm using Windows 8 on my (non touchscreen) laptop, for the overall improvements on the platform and I'm very happy about it so far. And it means I have day to day experience using it.

And so far, I think the Mail-app is one of the weakest apps to the point where I wondered if Microsoft is seriously releasing this as their RTM, finalized Mail-client for the masses.

If I may ask: What part about it do you find so faverouble? Is there some hidden gem I have missed?