I guess GitHub's apps are kind of the hipster git clients on all platforms. I don't really like the Mac version (I'm faster in GitX), but this looks actually pretty decent and also what I was expecting for a Metro app. I'll give it a try later to see how productive I can be with it.
This is not a "Metro app" in the Windows 8 sense of the word. This is a "desktop app" that looks like a WinRT/Metro/"modern app". Just as a heads up since there is already terminology/tech confusion.
I don't actively use any git GUI client, but my reaction is to the style in general rather than anything git-specific.
I don't claim to be a design guru, but it looks like somebody was going for minimalism, but used a nuke instead of a scalpel. My eyes don't know what to focus on, there's limited indication of what things are, and in places it's hard to tell at a glance where one component ends and the next begins.
It's not so much ugly as it is intensely vague and somewhat undiscoverable.
Edit: Just to be clear, I don't want this to be seen as a criticism of this app or its developers specifically, I'm operating under the impression I'm getting from other commenters that this is very Windows 8-ish in general, so take this as bewilderment at the Windows 8 style.
