It would be useful to know more about Heavy Rain first, so far I have only seen a few screens which may or may not be touched up. I'm inclined to think it will not reach the heights of intelligence or gravitas it is aiming for.
I do feel gaming needs to develop, 'fun' should not be the base measure of a video-game. I feel the conventions that have come to characterise video-games- objectives, physical interaction, high scores, instant gratification- are holding the industry back, as are the gamers who are more than willing to accept something on the grounds of 'fun' alone. I'd hope when I listen to music or read a book I get a little more out of it than a bit of 'fun', I want it to stir my emotions and give me new perspectives on life.
There does need to be room for 'fun' titles, my gripe is the industry is swimming in the equivalents of Rambo and Finding Nemo, we don't yet have our Citizen Kane so to speak. Some games go part way in acheiving levels of emotional and intellectual power but they always acquiesce, falling back on the crutch of convention and the most conservative expectations of the gaming community. I felt this particularly with Half Life 2, which started off so engaging and promising but before long became just another shooter, albeit a very high quality one with a deeper than usual experience.
At the moment I don't see the influx of new players or 'casuals' as a ball and chain of the industry, there has to be that outlet for the 'fluff' as I like to call it. I feel the core gamers, and the devs, are stunting our growth. Firstly because they have such entrenched expectations and secondly because profit is always the overriding factor, can't really blame the devs for that though, that's capitalism.
One thing that would advance gaming is a shift in focus from visuals, physical interaction and objective based play towards social interactions in games and the underlying structure that makes such a thing possible- that is the AI and narrative. I'm not talking about apeing cinema either, better narrative does not mean hour long cut-scenes, games so often separate the story and gameplay which is a blunder in my eyes.
I don't think its pretentious to demand and expect a little more from games, were the bebop musicians like Charlie Parker or Miles Davis pretentious because they wanted to be more than entertainers making finger-poppin music? Likewise were great actors and directors pretentious because they wanted more than trite love stories, the empty American dream and war propaganda? I don't think so. Its about advancing our artform, gamers have to take an historical perspective and realise just how little the architecture of gaming has changed since its birth. The exterior may look wildly different but the foundations and the scaffolds are still the same.