Before anything else: I would be infuriated if she slept with a man like those TV shows. I don't watch those because I think those are degrading. I saw Samantha Traynor, a fictional character, as someone hanging out with a male friend that may or may not have been attracted to her depending on the character that the gamers played.
I don't make a choice to watch this kind of shows specifically for this trope, it's just that usually when lesbian character is introduced, sooner or later she ends up having sex with a man (usually looking like she enjoys it). It seems that it's actively pushed by network bosses, since in one such instance, when that trope was used in NBC Dracula, the creator of the show himself joined the critiques and said that the episode was executed in offensive way against writers' intentions (though initially lesbian character was still meant to sleep with a man, but she was supposed to look traumatized by it - in actual episode, or specifically, version that was aired in Britain, she ended up looking like it was extremely enjoyable experience for her).
As for Traynor, I think that comments under those YT videos show the best what was the purpose of it.
No matter what though, in the end, you will stick with what you said because you believe it and I will stick with what I said because I believe it. I'm a bisexual woman who is embarrassed of my body and maybe for me, seeing Traynor walk around in her swimsuit around a male friend made her seem confident and comfortable to me.
Traynor is lesbian though, not bisexual, and the fact she was used as sexual tease for men made me, "corrective" rape survivor, feel uncomfortable.
That being said, let me put it this way; I appreciate Bioware for that fact of the matter that they *tried*.
It's not like Bioware is the only company that touches this kind of themes these days, we're not in situation that we shouldn't be critical because it could discourage them to do it ever again. Gone Home was done by 2 straight guys and straight woman (later lesbian woman joined the team, but from what I understand the story was already written and she was there for technical side of game development). And they managed to make a great story, avoiding all the damaging tropes.
They succeeded in the eyes of some and failed in the eyes of others. You and I are both right. If they (people who played ME3) saw what you see then yes, it is damaging; if they saw what I see then it's what I originally replied.
No, actually it would be damaging if they didn't see those issues, because then it would just subconsciously reinforce stereotypes about lesbians encouraged by our society. And like I said above, reaction of youtubers shows what majority among target demographic of those scenes, straight men, saw in it.