Well if we talk about Alistair and warden romance then there isn't any satisfying ending at least for me. I don't like that he has to sleep with Morrigan. If that wouldn't happen then I would call that romance satisfying even if it would be hard to achieve. What comes to Morrigan and warden they don't have that thing. Of course you'll have to do to DR for yourself but that wouldn't be a problem for me because she would be my LI and of course I would do that thing for her. Of course she leaves but I think she really doesn't have a choice in that and then there is a reunion in WH.
All of the issues with Alistairs romance, as far as I'm concerned, would be solved by simply being able to recruit Loghain and have him kill the archdemon as an alternative to taking the dark ritual.
Although that being said I really love the dramatic aspect of "We're in love but one of us has to die to stop the blight", that is a really chilling revelation that wouldn't be out of place at the climax of a really good novel. The fact that Alistair always takes the kill if you take him along only adds to the hearbreak!
Actually, as horrible as it sounds, I actually think that all of that makes it a better romance, and one that should be seen as a standard for future romances to follow. It is possible to have a happier ending if you are willing to sacrifice some things, but if you aren't then it reaches a really chilling and heart-wrenching end. That's the sort of thing I want to see more of, because it's the hallmark of an incredibly well written romance in my opinion.
After thinking about it over it only gives me more respect and appreciation for Alistairs romance path, not less.