First of all, I'm not sure how anyone could think Ian is a wuss, unless they're picking the choices to make him act that way, or there's a bit of self-projecting going on or something? Cos whenever there's a confrontation Ian either has the choice of getting physical or using his intelligence to deal with the situation, and that's on the player. He isn't a weakling physically or mentally.
Also, there is nothing wrong with this game not being like GGGB. I liked GGGB quite a bit, but I'd say that this game is already better then GGGB - more engaging and better characterization, better graphics, not to mention the artful way in which character's stories intertwine. I'm not sure why we need to have a repeat of GGGB anyway? That story was told, and Eva isn't a one-trick pony - she's probably eager to use her experience from that game to create something better in this one.