It's hard to believe that Mega Man has more than 150 games to his name (including the few that were canceled), but it's true.

My favorite ones have to be the Legends games, followed by MM3, Battle Network 6, and X Command Mission. Although I am a fan of most of the MM games except for Rockman & Forte for Wonderswan, and the MM game for DOS.

Command Mission is one that I wish Capcom would make a sequel to. It was a project that they started alongside Breath of Fire: Dragon Quarter, so it's kind of a short game and devoid of sidequests and such. But the battle system is awesome.