Quite honestly, exploring the back story of the Andromeda move at the same level of detail as a book in the game would have severely bogged the pacing down. For that reason, the game was always going to involve some sort of tldr of what happened. With the book we will at least get it dramatized.
Speaking of getting "dramatized" - with reference to Mass Effect trilogy the background literature/comics gave me a whole new perspective on certain characters that I became obsessed with - Jack Harper and Anderson. The games themselves did NO justice at all to these two characters.
One won't know Anderson unless he has been through 'Revelation' (my opinion, though). On the same note, if there was only one character in the entire trilogy with the most logical, rational, unprejudiced mind - it was definitely Jack Harper - who would see the world through shades of grey and NOT only black and white (again, these are only my thoughts - and no one needs to agree on this) - I felt unless one has read Ascension, and Retribution - it's impossible to know the MAN.
Oh, for the record - I will pretend that Mass Effect Deception never happened (and I wish I could unread that trash)!!!