This goes for Mega Man 1-6, and maybe to some extent the later games in the series.
What is your favorite type of robot master power? There's a few general types.
There's the shields, the bombs, the almost infinite projectiles, the homing shots, etc.
Which of these do you find yourself actually using? Do you like to use the shields when doing a tricky jump surrounded by floating enemies? Do you like to use the bombs to break walls? Or do you just like to be plain cheap with the metal blade?