I dunno, MGS may have a modicum of self-awareness, but that doesn't stop it from being uncomfortably full of itself.
Sure, there is plenty of goofy stuff to point at and go, "See? MGS doesn't take itself too seriously. What serious game would have masturbation jokes?" But Kojima then expects us to become engrossed in his 40-minute cutscenes about the intricacies of the world he's built around war and death and other heavy stuff. It's just so schizophrenic.
You see, some people understand that humor can be used to break the tension in a deep, complex, emotionally depressing story. Kojima seems to have heard of the concept, but the way he executes it is just to throw in random weirdness and boobs at unexpected times. Sure, it makes us go "Wtf?! That's so nutty!" and sure does break the tension, but it also breaks the mood, the immersion, the believability, and the investment.
The only way I can even take Metal Gear seriously anymore is it goes for broke with the silliness, like with MGRising.