Druids make great tanks. Like any other class, they have strengths and weaknesses, and one of those weaknesses is that they can't use consumables, like health potions, in feral forms. A while back there was some buzz about the devs letting them use some potions in forms, and just having to decide which ones; that's been the Blizz party line for a while now. Now it looks like that may not be happening after all, basically because Druid tanks are currently working as intended™:
Unfortunately we do not yet have much new information available regarding this topic. The developers are still evaluating which pots and procs should be usable in forms, but it is not an easy evaluation process because for the most part Druids currently appear to be performing where the developers want them to.
Because the Druids appears to be performing the way the developers want, then they have to be very considerate and cautious in the evaluation process in order to avoid potential balance issues, which means that they also have to consider whether or not pots/procs in forms is even necessary anymore.
I know that this might sound like bad news to some of you, but please remember that the evaluation process has not yet finished so it is still too early to proclaim doom and gloom.
Druids, what do you think? Do you need pots, or are you doing OK without them?