No, that's going too far. Compared to what? What standard are you using here? Name me one single videogame that "explored cultural, religious and political tensions" in some truly meaningful way. There isn't one. PST is generally considered the "deepest", most mature videogame ever written and it's still just a superficial fairy tale compared to truly deep novels, movies or stage plays.
We have discussed this in some other thread. Videogames are still generally derpy and infantile, in the same way the first movies were. If you wanna explore the depths of philosophy you have to do it somewhere else. You wanna play videogames, especially the AAA ones? Then wizards, dragons and elves is all you're gonna get. The templars vs. mages subplot in DA2 is about as mature as it's gonna get in this industry. Put it another way - Bioware games are not bad because they're not "deep" enough.
PST was pretty well written. It was certainly not weaker than, say, your average Joss Whedon / Christopher Nolan, to use a few examples from screenwriting. But movies aren't primarily judged by their screenwriting, and the same goes for games. PST is an example I'd comfortably use to say that games already have deep writing. It's the rest of the game that I'm not comfortable using.
And no, there's no Tolstoy in video games, in the same way there's no Dickens in screenwriting. These are not literary mediums we're talking about. They're cinematic ones, at best, and in the case of video games, not even that.
visual and interactive media are better-suited to understated, implication-heavy storytelling. they don't have the space that a novel does. that said, there's absolutely no reason why the script of a game or a movie can't equal or exceed the script of a novel. it's just not where the development focus generally goes, because the audience the genre has cultivated in its short history isn't one that likes words. or thoughts.
you don't have to tackle "serious real life issues" to tell a compelling story. it's almost a cop-out, although it's so hard to do well that that's really not fair of me to say. what's really impressive is telling a story that makes people care that they -can't- relate to their own lives. a story that's about people, rather than about ideas. A Song of Ice and Fire might qualify as an example; it's really not making a statement about anything except for the nature of blame and consequence. ASoIaF is so great because when you ask "whose fault is this whole mess?" the chain is endlessly looping, and at every stage you can understand why the character did what he or she did, as shitty as his or her choices were. there's no reason you couldn't tell a story like that in a video game. it's just a question of budget, of perspective shifts, of text versus voice acting.