I thought Steve was a nice move away from stereotypes in ME 3. He was an Alliance soldier. He was a pilot. He was a bit of shuttle craft geek (debating which vehicles were better; knowing obscure facts). He had a great joking relationship with Vega, in which they ripped on each other and were competitive. He was a grieving widower, who was dealing with the loss of his spouse. Oh, and he was gay, too. People claim that his entire character arc was about his dead husband and, while it was the bulk of his dialogue if you friend or romance him, he was more multifaceted that people give him credit for. I think he was a great example of a character who was gay (versus "the gay character"). So I think that if DHMG is Dorian and also the gay LI, they will do him right.
I agree for the most part, although any cultural representations of gay people are going to be a bit of a "damned if you do, damned if you don't" situation. By definition a lesbian or gay character is going to have to mention or reference their sexuality at some point, which is why Steve still attracts criticism of shoving things down people's throats/in their faces/other innuendo.
I think, however, that a few people also saw him as deliberately inoffensive to the point of being slightly problematic, in the sense that he was about as non-threatening a gay man as you could think of, and various aspects of his personality seemed to fit a "break stereotypes and endear the character to straight men" checklist. If Bioware were consciously doing everything they could to avoid stereotypes, doesn't that make Cortez sort of a cause instead of a character? A way to prove they could make up for the complete absence of m/m in ME and ME2 while also not scaring away young men, which seemed like the reason for the lack of gay characters in the first place?
Steve seemed to be accepted by a majority of Mass Effect players precisely because (as I've often seen written on the BSN) he didn't 'perform' to typical expectations of gay males. For all that it's fantastic to see more diversity in portrayals of gay men (*especially* in videogames), I'm wary of that sort of portrayal if the reason for doing so is avoiding a backlash by bigoted young men on the internet, frankly. If Steve's character was defined in light of the response they expected him to receive, then all of that might've been done as much to avoid controversy as to break new narrative ground.
(There's also danger in the assertion that masculine characters "just happen to be gay", while someone campy or effeminate would be flaunting their sexuality, making it the centre of their character, etc. Compare the different reactions to Steve, Anders and Zevran.)
Maybe that's too cynical, and I don't doubt the sincerity of the writers in wanting to do something interesting with ME3's s/s LIs, but I sometimes have a bad feeling about where Steve in particular ended up as a character, and the way in which people associate his personality and masculinity with being an interesting, strong or "realistic" portrayal.