Actually, I happen to think both "halves" of druid powers work very well together.
They all use the same implement, and the same stats, offensively and defensively.
And, there's some synergy .. savage rend, for instance, is awesome as a follow up power.
Say you open with Storm Spike, it's not a bad plan to wild shape and move up into melee.
I mean, they can shift or attack you and get hit for extra lightning damage ... or try to get away and provoke a savage rend ... which you can use to slide 'em next to an ally for even more annoyance.
When everyone's packed tight, wild shape (and get that free shift), drop a wall of thorns strategically, then move around.
Next turn, why ... how about a bit of this here storm spike, wild shape, flanking action?
Or just savage rend someone into the wall?