However does video game has the potential to tell stories on par of the standard of let say a great Star Trek episode. I would like to say yes to that question. I do think KOTOR and Mass effect and dragon age (first game of the series only) would be around the same standard as an excellent Trek episode or movie in terms of storytelling and characterisation.
Whether it can produce a Shakespeare or a citizen Kane is another question that I'm not qualified in discussing (as I know nothing about either of them)
although I like to think that perhaps one day in the future it is possible for someone to develop a breakthrough work to elevate the genre of video games into higher arts even if no such exist today but that's just speculation from my part (and really if a video game did achieve I'll probably too conservative and populist to actually like it and complain that games are no longer entertsining)