There indeed are many "Idiot" barbarians out there, just as there are "Chaotic Stupid" rogues and "Lawful Stupid" paladins. They are the easy entryways to the game though and for someone that easy way might be the Drow girl in skimpy clothing and a flirtatious attitude, even if said thing is nearly impossible lore-wise for a multitude of reasons. That's why they are tropes: They are easy to approach so you see them often.
I don't think we have too many of those though: Orchid is no idiot (if a bit foolhardy), Brannor is no unwavering bulwark of faith, Parum's self-esteem does not seem to be through the roof (and they are not flirting with everything, something I believe to also be a Bard trope), Kyra is not some acolyte straight out of seclusion and Torus isn't the typical tree-hugger either. We've got quite the group of trope-breakers in our hands.
I don't think we have too many of those though: Orchid is no idiot (if a bit foolhardy), Brannor is no unwavering bulwark of faith, Parum's self-esteem does not seem to be through the roof (and they are not flirting with everything, something I believe to also be a Bard trope), Kyra is not some acolyte straight out of seclusion and Torus isn't the typical tree-hugger either. We've got quite the group of trope-breakers in our hands.