hmmm, dunno - So far I found the druid to be pretty powerful (even with my terribly specced land druid). You just sort of waddle around doing a bit of everything while your damage dealers kill the enemies. You are just not the balls-to-wall tank you might think to be, but I found the beast-forms pretty nifty for getting to those pesky archers or turning the fight around when my hp pool gets low. Granted, I didnt make it to the underdark yet, but I pretty much cleared the goblin fortress and spider caves without leveling to 4 and using any cheese strats (which is pretty difficult tbh since darkness/fog-cloud has such weird AI interactions).
My guess is the class will feel a lot more rounded once larian implements crafting and takes another look at the resource model.

I kinda think that they should move the polar bear form to a later level and have the same standard bear form earlier (though I haven't tried moon druid yet), just for flavor reasons.