By hard statistics (People just won't stop doing this): There is no need to preorder AAA games and people need to stop throwing money at piece of shit companies like Blizzard.
Edit: Lol I think it's hilarious that even though I prefaced my comment with the note about statistics, there are still people below that don't realize "Don't pre-order" is only a popular opinion in comments on Reddit lol. "Don't pre-order" is an extremely, outrageously, UNPOPULAR opinion in the general public.
Some people here are really falling into the whole Reddit stereotype of being completely disconnected from reality, thinking Reddit opinion represents the majority.