I feel like people are really giving DA:O too much credit on this. Yes, you could go up to Leiliana (for example) and kiss her in camp, ask to turn in together for the nigh etc, but it was always exactly the same dialogue, the same kiss animation. It still didn't feel like you were in a relationship at all. Basically, the romance storyline was over by that time, except for a short talk at the Denerim city gates before your final four depart to fight the Archdemon. DA2 meanwhile keeps the storyline going over the course of the game, but at the expense of any direct, 'anytime' sex option at home. But with the party banter acknowledging the romance more, and the fact that it persists and evolves over the 3 Acts, I still prefer DA2's approach.
Not that I think Bioware have ever really got this thing nailed down. For all the attention that the fans pay to the romance angle, and given that people have been callling on them to do it better since forever, its not like they haven't had plenty of opportunities. Yet they continually produce underwhelming and unfulfilling romances, or reasonably promising romances which abruptly stop and lack any further content etc. Its actually a symptom of how little your characters interact with each other. Sure, you can talk to people about the issues that matter to them, move their quests along etc. But scenes where its just you and the character (or even rarer mutiple characters) just knocking about and hanging out, are extremely rare. Basically, Bioware have learned they need to have some scenes like this, but LI characters tend not to get much more lines or animations than they would have done anyway during these scenes.
We've told Bioware this many, many, many times, but they never seem to get the message. For romances to truly matter in the way that people want them to, you need to put in scenes throughout the game that show the relationship, change up key sequences to reflect whether characters are together or not. The old saying of 'don't tell us - show us' applies. Talking to other characters and having them comment on the relationship is one thing, but actually seeing the characters together and speaking, interacting in a noticeably more familiar way during scenes that aren't necessarily anything to do with romance, is surely the way to do it. So we don't have the situation where the characters are only intimate during designated 'ROMANCE SCENE moments.
Now, you could say that there's really no excuse for how lame the romances have been over the years. Seeing Mike Laidlaw talk about people wanting to see relationships that feel realistic like its some amazing revelation he's just come to, is embarassing. People have been asking for them to take this more seriously for decades! But the occasional slip through the PR net has given the truth to the lie - i.e that the writers don't really like writing romance and would rather not do it at all, if they could get away with it. Well tough - they have to accept that the romance angle is (quite obviously if you look at just these forums alone) important to a great many people. But fans of good storytelling wince in horror whenever romance is mentioned, because they always *always* make such a horrible, unsatisfactory mess of it. There's never enough content, it doesn't feel realistic enough, it happens too quickly etc etc.
Because the romances do unlock too quickly (and by this, I don't just mean the actual conclusion of the romance - usually, even the earliest of conversations with LI characters are blatantly just 'preparing the way' prelims for the 'main event' later. It makes the characters feel like 'Hey, they're into you - its obvious' followed by 'Here's your chance to help them out and get this show on the road' setting the final 'You helped them out, they feel they have a connection with you that they never expected etc etc etc - SHAZAM!' Instead of this silly formula, I want to be able to talk to the characters properly, without the game constantly trying to hit you over the head with 'THIS IS A LOVE INTEREST CHARACTER - ARE YOU INTERESTED?' I want to be able to talk to Cassandra etc about the threat before us etc, without having the conversation hi-jacked by her mentioning an overbearing father or long lost brother or whatever, which is basically the game acting as your wingman saying 'Take this stuff down - it'll come in handy later when you're making your move, my man...' Romance is fine, but don't reduce LI characters to only being that - it often feels like the LI characters have nothing at all to say if you aren't in a relationship with them.
I think there's a balance to be struck on the part of writers and gamers here. The writers have to accept that they haven't met the needs of the fans on romances and that whether they like it or not, this is something that matters greatly to many of their hardcore fans. After all, having optional romances with any kind of depth is still pretty much a unique selling point for their games, as its something (dating sim) outside of very specialized games, and placing it in more mainstream products. But on the other hand, the fans need to accept that romance literature, like dating sims is a very niche market usually, and its not unreasonable for writers of more traditional science fiction and fantasy etc, to be reluctant and/or feel ill equipped to tackle this kind of thing. Especially when games fans get so up in arms whenever writers are brought in who don't necessariy care about games themselves etc.
I just think both sides need to be aware of the realities here. Whether they like it or not, or feel up to it or not, the writers have to do this now - its long since passed the point of no return for romances in their games. Its here to stay, so they're going to have to try and get better at it. For the fans, we need to realize that writing romance is a specific genre of its own in literatire, with its own set of writers. Frankly, most of the writing staff probably *really* don't want to write romance and would rather be writing the battles, and politiics etc etc. This is likely to be outside their comfort zone (even if concerning their own sexual orientation or whatever), so we should manage our expectations accordingly. Bioware have never delivered on this yet, but given the circumstances, we've probably gotten about as good as could be expected.