I thought the Dorien relationship in DA:I was very well done. He is gay, but even after you decline his advances (assuming you're male) you can still do his entire personal quest line and even be really nice to him and help him out with his problems, and he never hits on you again and in the endgame tells you that no one has ever been as nice to him as you and that you are like a brother to him. That's how a well-made relationship system should work.
Re. Morrigan, yeah she's relatively easy to romance, and also yeah she's one of the best cRPG romances of all time.
