I would think an enhancement might be an excellent option to include with melee.
Not sure if they'd be a good option with several of them.
Well, not a bad option either, just not sure if they're the best.

In the near future (3.3, assuming no changes), they'll have Magma Totems and the new PBAoE Fire Nova spell.
They can stagger Tremors for partial fear immunity, or go with Stoneclaw, Stoneskin, Strength of Earth, Earthbind etc.
Groundings vs casters, and a windfury totem.
Several healing stream totems for passive heals.

They won't have a ton of spell power, so healing as far as their own spells won't be huge, but its still an option.

Mail armor will make them less squishy then a Cat druid or Rogue in melee, especially when stunned.
They won't be as durable as a warrior or paladin.

I know a mixed team is harder to box, but...
A single enhancement, with a mixed group of melee or mostly one other class.
I see most of the benefits of enhancement from having one, and improving other melee.