I feel like another thing is that this "villain" or "hero" or whatever, is willing to take chances.
Corpyheus seemed like one of those types that wore the dark clothing, made lots of silly speeches, but where was the malice or action anyway? Did you ever even feel it as the PC? Arishok was similar, all that hyperbole but the guy literally just sits in a chair the entire game waiting for orders, he's a waiter at a high priced restaurant, frustrated at the lack of respect for his perfectly crafted souffle, but mostly willing to passively accept what he's offered anyway. If he was truly a brutal warlord (the impression they seemed to be trying to transmit), or something like that, he would of had one of his soldiers kill you in your sleep, but instead he politely duels you in the most ceremonious fashion after having fulfilled all the requirements to the letter.
It's like give me a break, you guys both talk up a storm but at the end of the day you are just sheeps in wolf's clothing.
Loghain for instance killed your mentor and slaughtered thousands of your comrades within the first hour of the game. It also had the advantage of being sort of complicated by his interest in protecting the realm and all that, but primarily you could feel the impact of his decisions, he wasn't a passive bystander and he wasn't particularly interested in your opinions or feelings on the matter. What did the Archdemon ever do? He basically just send out lesser demons to wreak havoc on a few farmers, overturn some barrels, but there's no real direct connection between the player and the "villain."
It can apply to heros also, Hawke was similar, a "superhero," but what he/she defend? Your PC in DA:2 enables virtually everyone they come across, the city turns to ashes while you make clever sex jokes in the bars and quest endlessly for money and power. There is no sacrifice, no empathy, no falling on the sword for another, or any such a thing. Everyone is just kind of dodgy and evasive the whole time about everything.
If it feels like you are up against people who can't go out on a limb than it makes them look weaker, with people who don't really care in the first place. At any rate, the "villain" crown hardly belongs on the head of a high priced waiter or whiner, no matter how amped up the presentation.