One of the reasons I gave up playing Sacred 2 co-op is because only the "primary player" got the full experience of the game. The other player missed a lot of little things, like voice acting and pop-ups explaining quests. In fact, it was very difficult to make sure that both players even had the same quests in the quest log. The primary player had to read aloud the quest descriptions for the other player. It was really stupid.

Compare that to Gears of War or Halo, where the players join the game together, and the experience is evenly matched. Both players earn mostly the same achievements.

So will Hunted's co-op experience be more like Sacred 2 or more like GOW?

Well, only going on things I have read or seen in clips on the web, this co-op seems like a very fluid experience between the ranged and melee characters, with one's abilities able to be built on by the other player.