I 100% agree with you here. I would have loved to see it be more gradual, too.
Well of course there's all this angst but in the end they overcome it, and there is a happily ever after. I love a good happy ending. I just like to see the storm before the rainbow type of thing.
In games, books, films, etc there usually needs to be some sort of hardship (be it in the romance itself or situations occurring outside of/around it) to make the relationship worth fighting for and all the more sweet if/when it succeeds.
This is another reason why I feel that they should've kept the Inquisitor's anchor hand wound as a serious threat to his/her health all the way through the game. If stabilising the breach had merely dulled it's effects to be slowly killing him/her instead then that would've been a personal reason to defeat Corypheus and get that orb off him/destroy it (since the orb is what caused the mark in the first place, which then becomes corrupted by Corypheus... you can tell because it starts glowing red, LOL!) AND would've added more to the inquisitor's personal and romantic motivations throughout the game, for example:
"I'm gonna shag around because screw it I'm dying anyway, so let's have some fun",
"I'm gonna avoid relationships because I don't want them to grow attached to me if I'm gonna die"
"omg I'm falling for this person but I'm dying ANGST AHOY!"
"bugger it, let's just be really reckless with my decisions in this game because yolo!"
And so on. Then of course if you prepared for the final battle and worked super hard then you'd survive it, or you could purposely sacrifice yourself by using your magic hand to kill corypheus but in doing so draining you of your life, etc etc blah blah blah. By having that whole "**** I'm dying (albeit slowly)" situation there not only adds a sense of urgency, but creates the opportunity for your external injection of angst into what would/could otherwise be a nice easy romance.
Such a missed opportunity.