Courtesy of Coffee with Games (via GoNintendo), here's Mega Man 10's stats:
Mega Man 10 was released through Nintendo's WiiWare service on March 1, 2010.
Mega Man 10 took approximately 50 days from its release, for the play-time data shown to appear on the Wii's Nintendo Channel.
Mega Man 10 costs 1000 Wii Points to download.
Approx Number of Players Reporting Data:
Mega Man 10 currently has 7,463 players reporting their play-time data.
"Total" Game-Play Hours Reported:
Mega Man 10 has 54,018 Total Hours reported, for its debut on the Nintendo Channel.
Wii Shop Channel's WiiWare Rank:
Mega Man 10 is currently sitting at the #5 spot, in the WiiWare's "Popular Titles" section.
The "Popular Titles" section shows the "Top 20" most popular WiiWare titles that are being downloaded.
All of the above numbers can be found under Mega Man 10's page on the Nintendo Channel. All in all, I'd say everything looks pretty good. Those play time hours are just monstrous; I guess people are getting a lot of replay value out of the multiple characters, extra modes and the like.