While I find this a rather fitting alternative to the Child's Play thing which went under for very valid reasons. I still can't get behind these guys simply beacuse their statement is that they want a different ending. I don't want that, because all we're going to get is some half-assed, shoved out the door and poorly put together "sunshine and rainbows" ending that will be a giant middle finger to their fanbase.
What I could agree with is them adding to the ending, even if it's just a Dragon Age style text crawl that, put simply, explains what the crap just happened. I would be alright with this, because the -real- problem with the ending is that it's a cliffhanger. It drops us with no sense of accomplishment, closure, or explanation as to why anything we did mattered. Even people who enjoyed the endings are left with nothing but wild speculations and unfounded theories to try and prove why it was good. And that in itself is a failure.
As an example to prove my point, think about if the second game had ended like this. How would the fanbase's reaction changed if we knew there was still another game. There would still be a billion Mass Effect threads clogging up every forum, there would still be pages upon pages worth of speculation and theories. But we wouldn't be calling for change. We would be chomping at the bit in anticipation for the third game which we knew would answer all these questions. Now revert back to reality, we aren't getting a Mass Effect 4, not unless Bioware goes back on their word that this was going to be a trilogy. I believe that is the source of the dissapointment, that we are, however subconsciously, aware that this is the end, and there won't be any explanation, there won't be an ending to this story, and that's why fans are demanding change. This is why people are upset over the ending, not because it's necessarily badly written, but because it's incomplete, and that's what makes the ending a bad one.