I tend to agree, you have a company that is behind some of, if not THE greatest games ever made, and of so many genres aside I guess from FPS, and people say they don't like Nintendo games.
Could be the general kiddeh style of their most prominent IPs like Mario, DK, Kirby, Pokemon, etc, but they have made games for older audiences like Metroid and in a sense Zelda, Star Fox can be pretty damn epic.
But to me Nintendo's IPs are timeless and to me for EVERYONE, and age, taste, you name it, they're like the Disney of games, it's like saying you don't like Nintendo games is like saying you don't like Disney movies. It's taboo I tells ya!