What do you want us to say about it? I use it every day at work and at home, and it's a solid DVCS; I don't talk about grep (or any of my other tools), either, but that doesn't mean grep "failed".

It could be where you hang out. I heard about Git a lot when I was using Rails, because Rails used it. I hear a lot about Github here on HN, because it's a cool web startup. If you go someplace where Hg is used (and there are some big projects) you see a very different picture.