Oh yeah. I'm weird in that I like only either equality between couples OR entirely, admittedly fucked-up messes of pairings, and being someone pretty aware of gender issues, it's one reason I'm VERY selective on what het I like. It's even worse there than it is in slash, IMO, since a lot of writers go for either what I call the Suvian fallacy ("she's a girl, so she's just like me!") or the application of stereotypes that match the gender, but not the character (such as having a strong female character suddenly go all woobie and zomghelovesmeee because a man told her to shut up and leave him alone, or characterizing her as emotional and helpless, I've seen fic women who make weepy ukes look good *coughcough Meryl in 80 percent of Trigun fic*)

And yeah, it's pretty bad for het and slash alike. Once I thought maybe it was just my fandom since it's pretty attractive to people who *don't* want to consider how the writer subverted gender and orientation stereotypes and how it's now more sci-fi than the space western it started as and want to write traditional western. . . but it happens in almost every fandom I've seen.