Basically, as long as you make sure to summon some stuff every combat, you don't need to do anything else to contribute. Greenbound Ashbound wolverines kick ass at 3rd level, as do GB AB crocodiles. Spend your open feat on whatever you want (even Zen Archery, though IMO it's a waste), and you'll still be just fine. Hell, you bring more raw fighting power to the table than two Fighters! Plinking away with a longbow for an occasional d8 will just make you feel smaller in the pants than if you hang back and relax until your animal companion and summons have finished the fight.