I played Mages in the first two games and I decided to do a Warrior playthrough be a Templar and actually was satisfied with the story. In the first two I wanted my Amell and Hawke to have that blood relation link too. I wish it was mentioned in inquisition but they seem to forget about that. It would make sense for them to get together in those 10 years up to the conclave considering their blood relation but anyway.
The templar story was cool. You feel more like the Herald of Andraste. People I actually see you take on an Envy Demon. Yes, the time warp stuff is more urgent to deal with however ultimately that whole mission amounts to a spell being dispelled/deflected from anyone who was in the throne room at the time. It's only your Inquisitor's word and Dorian's the people have to trust to believe this supposed future.
I feel like going for the Templars first makes sense, considering it's not set really in stone that you would lose the mages by siding with the templars or vice versa. In my story, I made it so getting the templars was the safer bet, to seal the breach then handle the business at Redcliffe (unfortunately you are unable to deal with redcliffe) so ultimately you're left to deal with the consequences of that.
And like someone mention the breach and rifts helped to amplify some of that time magic so if you could take care of that, the time travel isn't as urgent or at least it makes sense to prepare than go blindly into something you have no idea how it works.
I am disappointed you don't get Leliana and Cullen excursions in the Templar route like Leliana in the dark future and Cullen's Samson personal plot.
You kill him by opening up a Fade Rift in his gut which disintegrates him from the inside out.
Errr.. that's not what happens. You open a fade rift inside him and tear him apart. He's dead jim.
I never really understood the whole Inquisitor opening a rift inside him tearing him apart. Is that really what happens?
Good thing there are no Grey Wardens in the Fade for him to body jump into. 
I think he loses that power once you kill his dragon or is that just speculation? They say that a couple of times, I believe Morrigan does. However, when he died in Legacy he supposedly jumped into Larius/Janeka but for some reason that jump in the Arbor Wilds was a million times quicker and he didn't have a dragon back then.