I haven't gotten the chance to really play Super Smash Bros. 4 on my 3DS since I've been working constantly as of late. It's a great problem to have! But I look forward to chucking my 3DS across the room when I can't choose Little Mac during a match, because I know that I'll lose, because I am that bad.
Contrary to the comic, I don't think Little Mac is that bad (though Jigglypuff is my main). When used by inexperienced players online his moves can easily be predicted and, on stages where there is a ledge, he can be knocked off and punished at very low percentages.
But if you face an experienced Smash player on a flat stage with no ledge...well yeah, you know what? F*** that guy.