I'm very heavily in favor of the playersexuality option, and I'm essentially of the opinion that it's the ideal way to go. The 2/2/2 set up is nice in theory but what it ends up with is that if you still end up having restrictions and limits. Suppose a player exlusively attracted to the same sex wanted to romance one of the two straight options; what then? There is still the possibility you are shoehorned into playing the sort of relationship you don't want to just because you want to romance the character who happens to be straight. The playersexual set-up removes this scenario. If all the romances are available to anyone, you can play as a character of any sexuality you want to without ever being forced into one you don't want, gay players don't have to play as someone they don't want to and neither to straight ones, and asexual or aromantic players have the option not to romance anyone at all. I honestly don't see a single flaw in that set up. It leaves the maximum amount of options open without forcing any player into anything.
I don't have any strong opinions on the character's sexualities under this scenario because I already explained in previous threads while I don't think there's anything wrong with the idea of all of them being bisexual, and in fact that's how I like to see DA2's cast. But I do like the idea of some characters' sexualities being discussed and/or established to some degree, some less; character's orientations and romantic histories are far from irrelevant, but they don't define them. The way DA2 did it is good enough; leave some character's orientations open to your interpetation or imagination, like Fenris' and Merrill's, and some more established, when it's established in a way that relates to something relevant; Isabela's bisexuality is established through bringing up that she is sexually active and through the many kinds of partners she's had. Ander's bisexuality is (sort of) established through the fact that he is both clearly attracted to women but also had a relationship with a man. It's established not through brining up that they are bisexual, but in a round-about way, by bringing up past relationships and history because it is relevant to the story or their character or anything. This makes sense because they are not in a world where sexuality is supposed to be such a big deal; honestly, in fact, I think the concept of a sexual orientation doesn't exist at all in their world, but that's just how I see it. By establishing several of the romance options as being attracted to the same sex, whether or not they are also attracted the other, but not all of them, you achieve both representation and give the players room for their own interpretation on the character's sexualities.
Speaking personally, it was really nice for me to have several playthroughs of Dragon Age 2 in which I tried out every possible romance option and never had to play as a straight Hawke except only once. I'd like to be able to do that in other games too.
Origins was a pretty big let down for people wanting m/m or f/f romances, I think. They made most of the romances more even in DA2, I think, but Origins was pretty clearly structured for Alistair and Morrigan to be framed as the "main" LIs. It's pretty harsh that the "main" LIs were also the straight LIs. I really hope that they'll make the "main" romances the bisexual ones if they go 2/2/2 in the future. Well, or just not have "main" ones.
I can confirm this. It stung especially because, having gotten into the series through Dragon Age 2, I came into Origins expecting the romances to be the same and they... weren't. Really, anything is better than the Origins model. (Although I guess if you were romancing Morrigan with a female Warden it would make the Dark Ritual much more awkward and unpleasant, huh...? Plus I don't know if having two married kings would be lore-consistent, or something the Fereldan nobility would approve of, considering how they're both meant to be cis men which would mean no heirs...)