What are the best Windows 8 "Metro" apps?

The only Metro app I use is the Music app, and I spend as little time as possible inside the app (I'm just there for the free streaming service).

I'm not sure if it's because the whole Metro environment isn't well suited for me, or because all the apps I've tried range from "just doesn't work" to "... meh" (via "terrible" for most of them).

But I want to give it another shot. So, it's been a month now, what are the best Metro apps?