WTF is My Gear Score?

#	Class	Name	Guild	Score
51	priest	Kalysara		243
52	rogue	Rhari		-66
53	shaman	Syax		-269
54	demon hunter	Rookell		-354
55	priest	Anduinn	House Wrynn	-657
56	priest	Kelvan	The Midnight Society	-1,004
57	death knight	Coldwell		-1,253