or...maybe not
Was I being a d..k? :unsure:
Well, your entire argument against Nintendo, their dilemma as you said, is that they don't have "Mature" games, and the only reason you've given that "M" rated games are better is because they contain things that kids shouldn't see. You then heavily implied that the only people who don't like M rated games are those "not ready for it": ie, you basically said "if you don't like blood, gore, violence, and sex in all of your games then you are a child".
"Oh, but I didn't say that" you might counter. Bullshit. You did say that. You didn't use those exact words but that is the logical conclusion to be drawn.
Only an idiot buys a game because it is labeled as something; a savvy consumer buys the games that they think they will have fun with. And I'm going to blow your mind here, so get ready: it is possible to have fun without blood and guts splattered all over the screen. I know this is hard to take, but just think about it very carefully. Not everyone has the same tastes as you, not everyone likes the same things that you do. It's one thing to make fun of a particular game or genre, it's another to completely dismiss it. I make jokes about the number of Call Of Duty games that come out year after year but I still accept that, for whatever reason, people enjoy playing them. You didn't give anyone here that benefit, you flat out stated that you didn't think these games should continue to be made despite the fact that people continue to enjoy playing them.
So yes, you are being a dick.