I'm guessing most of us beat Mass Effect 3 without the Extended Cut and Leviathan. Some number of us had Javik with us, but some were unfortunate and didn't even have him. I was part of the discussion with the original ending, the addition of a new ending, the release of the extended cut and what it added, and leviathan and every time I claimed that the game should have included the aforementioned items. I couldn't believe the game shipped without content that seemed essential to the lore once we actually saw what it was. We could only speculate about the effect of experiencing it all new within the game. Speculation over. Brad is the test case and he experienced the TRUE Mass Effect 3.
In light of these developments how good could ME3 have been? I accepted the original Synthesis ending and didn't hate the Star Child, but god damn the game should have been what Brad got to play.