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they are just more useful than an offspec DPS druid assuming your raid doesnt require innervates or BRezes, which after familiarity with content that is more a luxury than any real utility.
Ret pally will offer an additional blessing if your raid is light on pallies, they will offer 2% more damage for their party via aura, and 3% more crit (roughly the same as 3% more damage) for the entire raid; casters and melee. Those two things will put them ahead of a druid's 5% damage specific group aura. DPS would be comparable I would guess.
Raid-wide it works out to 2% damage at best (see: Casters, DoTs) and Mangle is a decent debuff, if focused mainly on Rogues.
The bigger difference is that a Feral Druid brings Innervate, Combat Rez
and the ability to easily tank. I don't think anyone brings Druids primarily for their DPS, it's the ability to function as a great tank when needed but still do decent DPS with a nice group buff when you don't.
Besides, Combat Rezzes are _always_ good. Same with Innervate; even farm fights can get tough, and Combat Rezzes go a long way to turning a wipe into a kill.