druids were nerfed in 39, maim was removed . yet other classes gained higher level spells/DPS. me and my two friends have feral druids, after WOTLK we noticed in the BG they are squishy, we were like WTF!!! in some BGS. even in bear form, palidans drop them like candy due to Blizz's over zealous love for the palidan. warlocks hit their dots and siphon life, they gain health faster that a feral druid can DPS...your dead. try to pop and heal and you die even faster.
you will run OOM trying to get to a hunter, no way to lock them down and no crippling type poison affect till higher brackets
with fairee fire and once having maim, cat druids could give rogues a run for their money.....no more....gone. the feral cat charge from stealth is sorta like a rogues shadowstep....IMO not really that great
if your doing premades they can workout, but PUGS, like anything else, luck of the draw. we used to use our ferals as FC's in WSG.....seems like they are too weak for that too now