There should be no real need provided any important information about a character is supplied in game or in the codices. In some ways it is better not to if you are not playing a mage or a noble from Orlais as there is no way you are likely to have gained that information. A peasant in Orlais is only likely to be aware in as much as it affects their own life, which will vary according to how near they are to the action. They will know nothing about the character of the nobles involved in the Civil War unless they were actually their overlord. Even a noble in north Orlais may not have as much knowledge about the key players as a southerner, unless they have been constantly at Court.
A mage will know a great deal more because Wynne sent a sending to each Circle with information of what occurred on her mission, then the First Enchanters gathered, were imprisoned and escaped, and the Circles fell. So in a way, having information from Asunder will bring a mage up to date with the situation, if it isn't provided in the background to that class, which I imagine it will be.
Having information from books can make you prejudge a situation to which you might actually react differently if coming at it fresh. Had I known what the Architect did (or was trying to do) in the Calling, I doubt I would even have given him air time. Given how the Grey Wardens responded to you letting him go, and since they obviously must have known about him prior to the Blight, you'd think that they might have at least informed their newest Warden Commander of the situation in case he/she should run across him. So it was probably better from a plot perspective that I didn't know about the Calling when I played Awakening, but from a credibility standpoint I think they Warden should have been aware of the previous history. The Grey Wardens are secretive with people outside of their order but surely they should keep people briefed within it.
There is also all the additional information contained in comics to consider as well, which I haven't read, although you can pick it up from the Wiki. So I'm hoping that everything we need to know is contained within the game, including possible reasons for a character's motivations and it is not assumed that we will know it from earlier publications or alternatively is only revealed in a DLC (as was the case with Loghain and Return to Ostagar)