I’ve had my Lady Hawke romance both Merrill and Fenris. Guess she has a thing for pointy ears. And I killed Anders as soon as the game gave me a chance. The guy got on my nerves (I saved his life in Dragon Age: Awakenings and he repays me by running away from the Wardens? Way to get on my good side, asshole.) Plus I consider him to have been possessed by a demon the whole game anyway.
I was friends with Isabella and she came back with the book but I never completely trusted her. (She turned on me in the fade too; she likes big boats… hah.) She did comment on Hawke choosing Fenris over her though.
As for the end, I wound up siding with the Mages against the Templars. Not because I thought the Templars were completely in the wrong but because I thought the local Templars (under Meredith) had gone too far in the direction of paranoia. Meridith was seeing blood mages under everywhere and was basically willing to sacrifice the entire city of Kirkwall to get them.
I see the need for the Templars; we run into enough blood mages and get enough lore about the Magisters of the Terventier Imperium to see why the mages need an overwatch. Sort of how events over the past year in the Gulf of Mexico and Japan show why we need an overwatch over the oil and nuclear industries. But Meredith had taken that to the extremes and beyond.
How much of that was her and how much was the artifact, I don’t know.
I see a couple of themes in DA:2. The first, as I have said before, is a variation of “Power Corrupts”. Meredith was corrupted by her power with the Templars. Mages are corrupted by demons when they try to access the power of blood magic. The Chantry person (forgot her name, the one stirring up the people against the Quanari) was corrupted by the power of the Chantry. And so on.
The other theme seems to be that you have to take sides. At multiple points in the game you have to make the choice to support one side or another in a disagreement. Not taking sides leads to failure. The clearest example here is the Viscount; he kept trying to be neutral in the struggles between the Chantry and the Quanari or between the Templars and the Mages and lost his head for it.
In the DA2 world it seems that as far as anyone is concerned you are either with them or against them. There is no middle ground.