There is no gameplay incentive to make a lot of the "bad" choices in DAI. I enjoy the freedom to be evil if I wanted to be, but I expect some kind of tangible reward for doing so.
E.G. in Bioshock, if you consume more little sisters, you get more adam.
Kotor is, imo, the best example of this. Being a POS in that game really pays off by giving you a stronger character with so much more resources.
There is no such reward in DAI. Bioware does not tempt you to make morally corrupt choices. A lot of people will never see the lyrium cullen epilogue because Inquisition does nothing to incentivise the player to see that content. Imo, it's a huge weakness of the game. No question that people in large gravitate towards the altruistic idealist side of the spectrum, and this game does nothing to challenge that.
To be clear, while Morrigan initially doesn't want a traditional relationship with you, if you get her approval early, it becomes very clear she does want you sexually.
I was just thinking about this strangely. It can be tempting to pursue an evil character in the same vain as DA:O, except DA:I offers both no rewards for such a character and so little opportunity to be evil. At best you can be a jerk to companions. There are a few highlighted moments such as punching Solas but that's it. No opportunity to even kill any of them. All you achieve by being a POS is a loss of content. The saddest part is what it takes to get companion disapproval and how they react.
First, to get disapproval overall is far less from your actions but more from avoiding fetch quests/war table missions for that specific companion. The big decisions like allying/conscripting the mages/templars at best will earn +/- 3 approval with a companion which in the grand scheme of things is nothing and easily remedied.
Second, when you manage to achieve strong disapproval with a companion (usually through heavy meta-gaming) they behave like you have options similar to those you did in DA:O. Varric, Blackwall, Sera, Cole, Cassandra, etc. all act like you're some power-hungry tyrant who has ruined lives for the Inquisition's benefit. I'd love for there to actually have been opportunities to play that way. The closest thing is war table missions which ironically generally don't sway companion approval much at all.
In the end you can lead the Inquisition exactly the same way, yet in one game treat Blackwall poorly and not bother picking up his Grey Warden trinkets, and in the other the opposite, and he'll go from abandoning what he believes is a tyrant to considering you a good friend.