Garrisons are, IMO, hugely worthwhile. My caster group and hunter group are almost all at 625+ average gear levels with several 650+ pieces and they haven't set foot in anything but Slag Mines and Skyreach normals (I'm working on achievements on the 5x Prot Paladin group at the moment). The paladins are also 615+ now and I've yet to set foot in a single WoD dungeon with them.
It gets to 615+ pretty quick, and yes it's a lot of work up front. Once your followers are up to epic level mostly and you have several of them at 645+, good gear starts dropping frequently.
And the flood of greens from large crates is nifty, too.
http://us.battle.net/wow/en/characte.../Telane/simple
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