I've done the whole being apologetic cause you're too good for your playgroup bit, but really it shouldn't matter. I main as Samus and can play another two or three characters to a close level, so I just play as other characters until I feel like winning (I'm a bit of a jackass) then I pick one of my better characters. You just have to be smart about playing so that your playgroup won't hate you. Not to mention, if you do have someone like that who doesn't give an honest effort to make up for it, kick him the hell out. Don't waste your time not having fun with a game like Smash.