I'm also sort of intrigued by the memespecs like Balance and SP but even if your were the best chicken on the planet you'd still do a third of the warrior. Plus, your rotation is one button.
That's not the case of a powershift Druid. Their DPS tends to compete with Hunters. The difference is that Manual Crowd Pummeler abuse gives Feral Druids +50% increased attack speed (which is a massive DPS boost) and that powershifting with Wolfshead Helm and Furor (constantly shifting out and into catform, but your timing is important) gives your Feral Druid a massive boost to this energy regeneration letting him spam high damage moves much more often than normal catform Druids. This combination means that you will be doing something like twice the DPS of your regular idiot Feral Druid, and that's not even counting the difference that careful gearing and buff-stacking makes compared to your average idiot. That said Feral Druids as PvE DPS tend to be better on Alliance than Horde because Blessing of Kings and Judgment of Wisdom make a massive difference for a Feral Druid's damage output and long-term mana consumption. On Horde you get no BoK and the other melees have Windfury Totem, plus your mana recovery is not as good, so you will probably go OOM after about 3 minutes and it's not as competitive in DPS, unless perhaps you are grouped with a resto shaman who is giving you both Grace of Air and Strength of Earth totems and Mana Tide totem, but you still don't compete that well with the Windfury Totem users. If you get really good at the class, play Alliance side, and you're okay with farming shittons of Manual Crowd Pummelers regularly, you will do DPS comparable to Hunters and on certain fights, even Rogues and Warriors.
The main reason why I'm mentioning the Feral Druid though is because you seemed to want a DPS class that requires you to be paying attention and doing shit to do DPS. Powershifting Druid is about as interesting as it gets. Everyone else has got lazy rotations at most and single-minded button spam for the most part.