Mega Man X: Command Mission is a pretty mediocre RPG, the story isn't very interesting (although I appreciate that they finally made an X story that doesn't involve Sigma), the dungeons are frankly a chore to get through and the random encounter rate is mind-numbingly high, so why the above average score?
Simply put, the combat is fun, every character feels vastly different thanks to the action trigger mechanic which has you doing special inputs or little minigames to do a more powerful attack (think special moves in Mario RPG) along with the hyper mode mechanic which makes your character more powerful for a set amount of turns, sure towards the end of the game I just stuck with a team of X, Zero and Cinnamon (especially once I get the secret hyper modes) but it's still fun to experiment with such a large cast of characters.
Also I'm a massive fan of the X series so that helps too.