Is that such a bad thing? If he is the gay option (god willing, i'm planning to romance him on first play through with my male elf mage), I'm so glad that he seems to have personality and swagger and hasn't been made bland and inoffensive and politically correct ala Cortez. There's nothing wrong with characters with stereotypical qualities as long as they are rounded out and given depth. Flamboyant guys are hot.
Yes, it is. Because it dehumanizes and places people in little tight boxes. Gay men are men like every other man. They are not all into fashion (and for whoever it was that wrote on a past post that saying that gwy men are fashionistas is a "positive" stereotype, I have to disagree - nothing positive about being a fashionista, for that matter, I don't believe that there is such a thing as a "positive stereotype"). Not all gay men are interested in physical beauty. Not all gay men are dashing or excited about opera, ballet, or musicals. Not all gay men enjoy antiquing. Not all men appreciate furnishing, decoration, or interior design.
Using supposedly "positive" sterotypes is as pernicious as using negative ones, only more insidious. If "black men are good at sports", then it is OK to assume they have nothing to say about other stuff, and OK to not encourage black children to aspire to other careers. If "Jews are smart and good with money" then it's OK to blame on them any financial crisis that ocurrs. If "women are caring, nurturing, and maternal", then it's OK not to want one as a military officer, or defence minister, or president, or a scientist (see above link). And if gay men are so flighty and interested just interested in art, fashion, and trivialities, then surely they should not be entrusted with the care of children (Yes, I have actually heard a member of the British House of Lords make that argument during the debate on marriage equality in England).
So, yes. It is a bad thing. A very bad thing.
Stereotypes are everywhere, if Iron Bull or Blackwall are straight at the end (like Vega from ME3 for example) that's also a stereotype.
We have a quite a lot of LGTB characters in Bioware: Steve, Samantha, Zevran, Isabela, Merrill, Fenris, Anders, Herren, Wade, Sera... Dorian, if gay, will be the first flamboyant (we still don't know him.... but let's asume he is that way) gay character ever.I like politically involved characters like him or Anders and I hope he successes where Anders failed as a character and "politician"....
Sterotypes of straight men (especially white men) are less pernicious, because they are the dominating part of our culture and society. As a result, we have enough representations (both in our personal lives and in the culture around us), to have a more well rounded view of them. That said, there are pernicious elements to the stereotypes of straight white men - in that they internalize them (real men don't cry, real men do not express emotions etc.) and thus sacrifice elements of they could be.
As for the other LGBT characters you mention (and describing either Merill or Fenris as bisexual is extremely problematic, especially in this type of discussion, as these characters do not profess any sexual identity, Aside from Fenris' tryst with Isabela. there is no indication of their sexuality in the game aside from metagaming), I would say Herren and Wade were extermely stereotypical (likeable, perhaps, but stereotypical). And in a way so were Zevran and Isabels (the sexually insatiable or promiscuous bisexuals). Anders and Steve, admittedly were less stereotypically designed. As for Samantha... honestly, I didn't even realize she was a lesbian until after I finished the game, and read it online.
But I'll get off my soap box now, as this is not the purpose of this thread. I just get really ticked off by that kind of discourse.