Actually I'd call PvP at that (28) level a disaster for a druid. Mana going out too fast without Resto part (Furor and Nat Shapeshifter), while if you have it in your spec you don't even have Shredding Attacks and can only have 1/2 Feral swiftness which are quite a must in PvP. You do not have Pounce, you do not have Frenzied Regen, you do not have Travel Form.
You're generally screwed.
Druids get to be given the skills for all the roles a character fill in this game. The downside of this trait is - you don't get all the skills which make each 'role' complete until end game. No other class, for example, gets skills of such importance as Maim, Lacerate, Lifebloom or Cyclone are for the various Forms as late in game as the Druid does. Let's see... Maim is your only incapacitating finisher (bah, your only incapacitating non-stealth-required skill!) of Cat form (Rogue's don't get Gouge/Kidney shot at lvl62, do they). Lacerate, aside of Mangle (available no sooner than at 50th lvl), is your Bear's only non-next melee, sensible damaging attack - Swipe is generally too weak and too costly to use outside of dungeon/raid multi mob tanking situations, while Maul goes with your next attack and cancels any Rage you'd receive from it - so it is 'teh suck' as someone wrote in another thread ;d. Warriors have Slam and Execute quite a bit sooner than lvl 6x. Lifebloom is priceless in PvP, where everyone would want to counter/interrupt your Healings, as it is your second Instant Heal (first is Reju) which in addition stacks up to 3 times! And Cyclone... what can I say, it's your only Caster form's reliable "shut teh meh up, I wanna heal" spell.
So as I said, Feral druid at 28 is quite screwed in pvp.