Well, you have a fine balance to straddle when coming up with blank slate characters and ones with more of an established background.
Blank slate characters do seem a little more bland (though to many, myself included, that means more of an opportunity for personalization) but give you a higher amount of ability to RP and have 'big' effects on the setting and story.
Meanwhile, more established characters have more of a limited definition of character and have to follow certain paths of narrative to stay in character. They also are not nearly as able to impact the setting and the story to the extent of a blank slate. Hawke is described as the opposite of the Warden (and IMO the Inquisitor too), being more of an object that is caught in the winds of the plot, rather than a force for it as the Warden and Inquisitor are. That said, the strength of the established character is that they don't necessarily rely on player input to be their own character. They are more of a character in the conventional sense.
IMO, personally prefer Blank Slate characters, but I can appreciate ones with more background if they're done well and are relatable.
I just don't want to see the next Dragon Age arbitrarily kick down the Inquisition so that we can have another big ultimate organization built from the ground up to become the god-emperors of all Thedas.