My dad generally isn't interested in my games, because he only shares the war games and horror games with my brothers. He did kind of do a double-take and give me a weird look when he saw me fighting a pile of garbage in Mother 3, though...
My mom, when she finally catches up with my five-minute, comma-free explanation of the game's plot, characters, and every funny and/or freaky experience I've had while playing it, generally finds them all pretty nice, probably because I've never fought a monk with a giant parasite coming out of his head or (even when it comes to darker things), I always choose to save the poor mutated little girl or take down my enemies with a sniper rifle from five miles away.
The only game I can really say they've both commented on was when I had the Sims and would either spend hours building houses or doing creepy virtual recreations of our family and the people we knew...
Dad: "So, does this mean you're going into designin' houses, babe?" / "Oh, I'm not THAT bald- or grumpy- am I?"
Mom: "Can I have the green bedspread?" / "Aw, that looks just like your brother." <3