First of all I find that Trahearne is fine, though is voice does sound weird, in general he isn’t such a bad character, I feel he was just misplaced, introduced too late,
Now on to the personal story : I disagree with the OP, I played both Charr and Sylvari and thought their accents do feel weird, I care about them, I found myself caring about my warband and Vigil and taking down bosses seemed meaningful. In GW2 whenever I do anything, we will use the refuges from Fire and Frost as an example, I do feel noticed : Since I earned the volunteer title for my Charr all the refuges thank me and nod in respect, it might be a small thing, but whenever I come towards them I feel like I’ve done something great. I have changed this part of the world in a small way, and my friends feel the same way in Orr.