Just curious... why not? Didn't like the serious tone the relationship takes? If that's the case, I can see how someone who really enjoys the lighter aspects of him, and might have been expecting that from a relationship, might have been a bit put-off or disappointed by that.
Actually, I didn't find it serious enough, maybe? Or maybe it's not the seriousness in question but the romance (as in it's not romantic enough). I've thought about this a lot and the best I've come up with is that it felt like the feelings didn't run deep enough.
I'm a hetrosexual female and normally play hetrosexual females in DA. In DA2 though, I actually preferred playing a male Hawke who romanced Fenris. But... now that I look back on it, the romance of course doesn't change regardless of the sex of Hawke so maybe it's just that the Dorian romance is too far removed from what I've come to think of as fulfilling.
I actually told my husband that apparently I'm not cut out to enjoy a truly homosexual romance, vs a bi-sexual one. Maybe the depth, romance, etc IS there and I just didn't see it because I'm used to other "scripts" so to speak? I truly don't know.
I don't mean to offend anyone with these comments, BTW! In RL I don't care which way your ship sails and I have gay friends and family in long term relationships that are wonderful in their depth, commitment, and feeling.