Please do not flame me if you are a Sony fanboy and believe differently. This is just my opinion, and quite frankly I don't find waiting 20 minutes to play my damn game fun..
Here's a video from RoosterTeeth explaining:
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Umm, yeahh. Get better internet bro, it'll go way faster. There is no way that installing update data is a console's fault. You can blame the makers of the game if you'd like...but its not their fault that they decided to take up the multiplayer data space on the disk with better graphics, and a longer story line.