To be honest, aside from the games already mentioned, there isnt really much to add aside from what i actually hate about all these homosexual options. Its not so much that they exist, but rather that it seems like all the more high-profile games which have them tend to be very same-y, by that i mean that the relationship is somehow always portrayed the same way with very little variation. Though that isnt a problem because it isnt exactly easy to write proper romance plots for anything, not even in books or movies or anywhere, you can point to any romance-work and find faults in how the relationships somehow feel wrong, which is for both heterosexual and homosexual pairings.
What i hate most though is the reaction to them, the relentless bitching about how "thats not true lesbian" or "thats not true heterosexual" or any variation thereof, the whole argument of trying to force how people act, like two lesbians or two gay guys cant act a certain way because they are homosexual, thats like arguing that a heterosexual couple cant act in a certain way, it makes no sense. That being said, i feel most games which tend to include, or try to include such pairings always end up shoving it into your face. Best example being Dragon Age 2, the romances were kinda forced onto you, hell Mass Effect 2 had the same problem, unless you knew exactly how to navigate the minefield that was Jacobs Dialogue you would end up dating him, even if you never intended that, nor your sentences even implied it, course DA2 was worse, Anders being a big offender here. Its good that the option exists, but if its shoved too much into your face, it becomes irritating no matter what you think of the option at first.
I suppose the problem is that we havent yet figured out how to do it properly, either its subtle and merely background events with no real impact, or its shoved into your face over and over. Plus many games focus on the gender rather than the emotional side of it, i mean name 5 games, big known titles, that have ignored the gender aspect and simply portrayed two people in love, or falling in love to be more precise. The whole "you have many options" aspect of romance subplots in games hasnt really helped this, because when you got the choice of several potential partners in the game, its not really possible to actually show how a relationship develops.