WTF is My Gear Score?

#	Class	Name	Guild	Score
51	death knight	Rzn		311
52	rogue	Smolbean		28
53	warrior	Torque	Orb	-15
54	warrior	Popz		-64
55	warrior	Propanetanks		-114
56	rogue	Flinti		-123
57	shaman	Nausedias		-467
58	paladin	Sgtgrape	Immured Mantics	-504