I don't mind a gay character in a game IF this character is correctly written, which mean this character will not put his/her sexuality in front of my face with "you want to bang ?" (aka Anders in DA2).
I was more interested in Ashley in ME, because she had completely divergent and politically incorrect views (of course she lost them in the second game, and was even worse in the third): she was different (we don't see a lot of big racists in games today, worse: coupled with religious devotion). I thought for a moment to see her in Cerberus (a thing that could had been interesting).
It's not the sexuality of a character that should make a player interested in this character, it's part of it of course but it's that: a part. I'll not judge someone in front of me because is gay or not, being dumb or not is a more important thing to know about him/her.
And each time i see Bioware make interview about gay character (and gay rights), it seem their characters are, the majority of time, written around their sexuality and it began to be a commercial argument, a mean to advertise their games. Each time, just before a launch, we have several articles, interviews speaking about sexuality. I don't mind them but it's just a part (and normally, a little one) of the full game.
The only thing they showed was cutscenes, CGI and combat, combat, combat. It's an RPG, where is the story ? The choices and consequences ?
It's just a way for them to advertise the game, which is a sad thing. IMO of course (and i support LGB rights: we don't have to judge someone on a detail of his/her lifeand this detail should not lead to a suppression of fundamental rights).