Trying to prove that the gameplay in The Last of Us/Uncharted(s) is more mature and complex than gameplay found in Mario is comparing apples to oranges. And so is comparing storytelling between the two. I, for one, can enjoy both mature themed and family friendly games, but if some prefer one to another that's fine. But pretending that one is so much cooler than the other just seems silly to me. Even though games have become more mainstream, if you are playing either type of game around a person that doesn't belong to the video game community, they might just as easily say you're acting like a child (or a geek or antisocial, etc.) because to that person and many like them (of which are predominantly represented in the mainstream media) all video games are for children.
To me this type of bashing between different genres is divisive more than anything. In film, plots and set pieces used in games like The Last of Us/Uncharted wouldn't be taken seriously by a lot of critics either, and people here are trashing Mario because they can't take him seriously? How many times do you see a horror film or adventure score an Oscar over some high-brow drama? It's happened, but it's very few and far in between when it does. That doesn't make the material perceived to be less dense any less enjoyable. Heck, I'll take Freddy Kruger over Citizen Kane any day. That's what people buy after all (Avengers, Avatar). And Mario is the equivalent money maker in this industry, so why is that so bad?
I am glad that there are developers like Naughty Dog who want to push the medium further in storytelling, and I believe that video games are in their infancy in that regard. So hooray for some progress, but that doesn't mean every game has to be this heavy narrative with all types of buttons being pressed (sounds silly, but that's what's being argued about in some of these posts). Imagine if every movie in Hollywood was like No Country for Old Men (a personal favorite) or every book was like the Bible? I, myself, need some valleys in between my hills. Just like in other mediums, there's room for both immersive titles that put story at the forefront as well as twitch based games that are fun and easy to pick up.
Variety is the spice of life after all. Sorry if this comment was more of a response to the bickering in the boards than the actual OP.