Someone said earlier:
If you need to explain your ending, it failed.
This is very true. It's like having to explain a punchline to a joke. The joke is no longer a joke. It has lost impact.
But in all fairness the ending is pretty straight forward up to a point. It really doesn't need explaining up to a point. The problem is the "use your imagination to fill in the blanks." I think Casey Hudson said that about using imagination. That part doesn't work with tying up the loose ends of a story.
You sold about 3 million copies of the game. You have about 3 million different interpretations of the endings out there now, and Bioware says they want to continue the Mass Effect universe. 3 million different interpretations of the endings create a significant problem with moving forward especially with the "there is no canon" mantra we've heard all along. A ton of this crap is going to have to be retconned anyway. We've seen a ton of threads arguing about plot devices, deus ex machinii, whateverelsewhoneedsdetails. This is where the problem is: what the f*** just happened?
If any survey were to be done it would have to be unbiased. It would have to be done by a third party. Bioware would have to tell a survey group what they wanted to know, and the survey group would have to write the questions. Bioware could not do the survey themselves, nor could they have any input on how the questions were asked, nor could EA have any input on this. Surveys cost money. It is very easy to skew questions to get people to answer them the way a particular group wants the questions answered. Neutrality is key. This is why there are professionals who do these things. No leading questions allowed.
The sample size would need to be 1400 for all who bought the game and would be accurate within =/- 5% IF the questions were asked with neutrality and were not leading.
Another problem here is we're getting into asking objective questions about what some people would consider subjective material -- hence why there are so many interpretations of the ending and the conclusions of

because there is a lot of necessary information that was missing to draw any logical conclusion.