WTF is My Gear Score?

#	Class	Name	Guild	Score
51	hunter	Moltiin		314
52	monk	Bakka		307
53	priest	Kalysara		294
54	rogue	Rhari		-66
55	shaman	Syax		-269
56	demon hunter	Rookell		-354
57	priest	Anduinn	House Wrynn	-657
58	priest	Kelvan	The Midnight Society	-1,004
59	death knight	Coldwell		-1,253