While the summoner comparison might be valid, I think they are going for functionally different things. The way the classes are built, the hunter seems much more melee oriented. Also, comparing the druid and hunter isn't a useful endeavor. While it's true that the druid is better and has more utility than the hunter it isn't a useful comparison. No one would compare a wizard and a fighter. The druid is a full caster, and as a result better than anything that isn't a full caster.
However, the hunter doesn't need to be better than the druid. It's doing its own thing. It should focus on the unique class skills, and how the mixture of class skills from the two parent classes interact in new ways. Will it be better than the druid. Never. Will it be better than a ranger? maybe.
Also, I really think the animal focus should stack. I know the devs said they didn't want it too. However, as it is a class ability i think they should reconsider. A Barbarian's strength bonuses while raging stack with magical items. The ability has a set duration, so it's not going to be game breaking.