I came across this rather shocking chart recently.
http://raidbots.com/dpshistory/Overall/25H/
Feral is in 16th place, 30+% behind the top 3 specs. All 3 Warlocks specs are more than 20% above Feral. 6 classes have 2 specs higher than Feral, hard to believe when you add up tank specs, healing specs and PvP specs.