Git support on Windows was really poor for some time (I gather it has improved though), whereas Mercurial pretty much always treated Windows as a first-class citizen. That may have something to do with it.
On the other hand, I do find it hard to believe that hg users love their tools more. Generally my impression has been that git attracts a lot of people who are, shall we say, passionate about their particular version control system.
Ahh.. The windows bit makes perfect sense. I wasn't aware (not a Windows user). Excellent point about git's community also. As obtuse as the commands can be (Really? git push :branch_name DELETES a remote branch?), I still love it. Also, the relatively high number of people who claim to love cvs in the survey suggests the bar for satisfaction might not be very high here :|
On the other hand, I do find it hard to believe that hg users love their tools more. Generally my impression has been that git attracts a lot of people who are, shall we say, passionate about their particular version control system.