Okay, I'm going to kind of defend the lack of potential to be evil in this game. To be fair, I've personally never understood the appeal. Honestly? I think that the main reason why it's expected in rpgs is because many games had/ have a binary system (Fable, Fallout, KOTOR etc) for recognizing ethical choices. I prefer the approval system of Dragon Age-- I think it's more complex and realistic.
I mean, sure, it would be better to have the option to play as a complete psychopath than not because undoubtedly some people would appreciate it... but the lack of that option doesn't mean you're not role-playing. I think that role-playing is, largely, defined by choice but that the lack of the choice to behave monstrously doesn't mean that the game entirely lacks choice... just that particular one. Like in the Fable 2, for instance, you can only really express yourself as good or bad. In the DAI... there are a lot more variations of the Inquisitor because there are many more choices, and there's occasionally a whole myriad of reasons for making a particular choice-- and those motivations tend to say something about your character. Maybe your character shows they have egalitarian ideals by supporting mages and that they have a vengeful streak when they judge their prisoners. Maybe they're a strong Andrastrian but they don't believe they're The Herald because they think that's dumb. There's more roles to choose from, to put it another way. I think that the biggest let-down in terms of the role-playing in game was the Inquisitor's (kinda bland) dialogue rather than the lack of options when it came to decisions.
Also, creating branching story-lines in a game is difficult to economize and apparently only like 10% of (American) players choose the morally bad path when presented with a binary-- http://gamemoir.com/...e-good-options/. And maybe then they might mostly do it to be unique/ for variety's sake- because it's the only alternate option. I can see, too, that if you went ax-crazy and murdered everyone from the previous game then the next game can't feature many recurring characters that are essential to the plot (or you could go the Leliana-route)... so there's also that to consider.