Eh, I am coming from the perspective of a user, not a VCS developer. I find git repositories way easier to navigate, let alone perform complex operations on, because how they work couldn't make more sense to me.

From a user's perspective, Hg is so limited I consider it basically unusable.

I seem to get my stuff done in either. What's missing for you in hg?

Being an active user of both git and hg, I also can't think of any features I make extensive use of in git (rebase, feature branches, etc) that I can't get with hg. My workflows in both are pretty much the same, just a saner interface on the hg side. If anything, git doesn't have revsets, a really powerful query language you can use to sift through your history - see http://www.selenic.com/hg/help/revsets

rebase -i and add --patch were the dealbreakers

Also I have yet to see a hg tutorial that didn't at some point recommend making a second clone of the repo in order to do something complicated.