I actually watched Dark Frontier on my laptop at school. Maybe I should have watched it at home with surround sound and a big screen for the full impact? Still an enjoyable episode, though.
And about The Disease, there was clearly a good reason to consult the medical officer before engaging in sexual activities. There's no way of knowing what will be passed between two species. Didn't bother me.
"Dark Frontier" kicks ass in surround sound, especially when the Borg speak. I highly recommended rewatching it that way if you can.
I don't mind "The Disease" either.
The protocol seems like a sound one being you're now on the other side of the galaxy. New species, new STD's.
However, it might have been a little more interesting if Harry Kim being the foreigner in the DQ was the one that introduced the STD into their culture instead.