Well the reason for the plot summery of no 1 at the beguining is because they released no 2 for the playstation 3 as well. Microsoft on the other hand owns the rights to Mass Effet 1 so that game will never be released on the PS3. The thing is in Mass Effect every choice you make effets the next game so anyone who's never played 1 can choose the choices the effect the main plot of the story of no 2 at the begining so that they can be able to play the game.
The way it works is the Choices in 1 effect 2 in both main plot & side quests & 2 effets 3 in the same way. So if you had'nt played 1 & you went out & bought 2 then you'd be more than a little buggered if they did'nt give you the option to choose the plot choices at the begining of 2. You would be forced to go out & buy 1 then you would end up running the risk of buying 2 games that you might end up hating & cursing yourself for wasting your money.
