As a sibling against another, direct, hostile confrontation isn't gonna work. Nor cutting off the source of the "addiction" such as disconnecting the net or hiding the hard drive -- that's gonna drive him really mad.
Like most others here suggest, such a situation really gonna need some of your parents' help (no matter how you think they're not helping to remedy the problem) to reduce his time on the game. Convince them not to spoil your brother so much on playtime that he forgets what normal life is all about, and tell that he really needs to manage his priorities in life.
Another thing that might be close to being the "devil's advocate" is to digitally record all of your conversations and see the difference on how he acts without your parents, and how he does when they're visiting. Then show it to your parents what his true behavior is.
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