The entirety of Halo 3 did not need to exist.
The whole point was to prevent the prophet from doing what he was going to do, but guess what, they could have just blown up his ship with a mac gun when it was nearing Earth.
Why didn't they? All because Master -blam!- Chief was on the god damn -blam!- ship as well.
There you go. Earth's greatest hero single handedly caused an entire -blam!- extra 60 dollars to disappear from your wallet back in 2007 with his stupidity.
[Edited on 10.07.2012 12:53 PM PDT]
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Maybe the Dreadnaught launched an EMP ? unnoticed of course