Hello all. I haven't read the whole thread and I'd like to address the OP's statement directly.
First, I'm a firm believer that video games are an art form. When Roger Ebert, whom I deeply respect, said that video games can never be art, I wrote a long post about it. You can find it on my blog -
link.
On a second note I really don't like to see the "art" issue being raised to support the notion that the ending of ME3 can't be changed. I respect that some people may think that it shouldn't be changed, which is a different thing altogether, but still I disagree.
The most important reason is simple: the ending is weak. If we were talking about masterpiece sci-fi writing, no matter how tragic/bad the ending might have been, it would be entirely defensable. But that is simply, in my view, not the case.
The second reason has to do with the fact that, although video games can be art, they are also popular culture. This entire "fan crysis" is proof that Mass Effect has become a pop culture phenomenon, similar to Star Wars, LOTR, etc... And you can be sure that the passionate fans of these and other successful series feel "entitled" to manifest their opinions on what happens to their beloved characters and fictional worlds.
That said, the creators, authors, are legitimately free to choose as they wish - to change the ending or not. But when a creation becomes a phenomenon, isn't this a two-way relationship? Mass Effect has generated an immense landscape of iconography, fan art, fan fiction, fan blogs, etc... It is a good thing, for everyone, and certainly for BioWare. It means they were successful. But it also means an added responsability. And what we have to ask ourselves here is: does the end of ME3 lives up to that?
And you know what? It's not our answer that really matters. But the answer of the authors at BioWare. Right now, we're all sitting here, waiting, to see what they think...