Samus has always been cool...I personally haven't played any of the Prime games...But she still kicks butt as an action/sidescroller...They can milk the Metroid series all day long as far as I'm concerned (although I'll be dutifully pissed if they pass up a Return of Samus remake).
I don't think or know (or care, honestly) if Nintendo's list of games are 90% kiddy or w/e...What I base calling Nintendo kiddy or at least developing towards kids is the ratio of their top selling games. Not to mention just their first party games are mostly kiddy.
knuck could have made his list longer by supplying every single Pokemon game, every single Mario game...not to mention games like, ugh, Animal Crossing...But i'm mostly w/Burning Zeppelin, if they stay hardcore as they are, they'll continue to rule their little section of the gaming community...but, yes, making their system almost completely 1st party seems a little much...