The decon chamber was not a bad idea from a scientific perspective. But it was really used for titillation and not much else, considering how little of it was seen as the show progressed.
I think skin tights outfits had been so common in Berman-era Trek that by the time of ENT, everyone was desensitized to it. Skin tight outfits made no sense either in the context of ENT in terms of a uniform, and the writers had the ability to make it make sense, like there is a subculture of Vulcans that favoured this type of uniform.
T’Pol chest first into Archer’s face was cringey comedy, and a poor attempt to build a romance angle that wasn’t happening.
I wasn’t bothered by the Trip & T’Pol scene in "Harbinger" at all. It was surprising at the time, since its not something Trek was synonymous with. But nothing worth censoring.
The scenes in the Mirror Universe fit, considering it was well, the Mirror Universe. They are not as restrained as the Prime Universe, and has been established ever since “Mirror, Mirror.” However, everything was managed better in S4 though, including the sexy stuff.
At the same time,
It could've been handled much better. The decon scenes weren't racy enough. It doesn't make sense that they would wear underwear. And they're the furthest out in space, you could have Archer dealing exasperatingly with a crew who start mating like rabbits (T'Pol and Tucker, Hoshi and Travis, Reed and Major Hayes). Unexpected was a good start for regular series episodes, but they really punted the ball from there.
like this post said, it did not go far enough in ENT. Considering its pre-Federation, wild west in space setting, its something that could have been addressed a few times in the show.
ST ’09 & Into Darkness' scenes never bothered me, nor has what’s been in Kurtzman-Trek so far (but the way that Into Darkness scene was produced
was done in a pointless manner). TBF, I’ve watched a lot of TV-MA shows with more explicit scenes that what’s ever been featured in Star Trek though. It doesn't register to me in terms of controversy.