I remember that episode...but to be honest, it didn't bother me. I didn't feel like it was pushed more than any other left-wing agenda that you found in Voyager or TNG, though I think the episode of TNG I mentioned was much more forceful about the issue.
The one episode that did kind of bother me was Enterprise's Similitude, where they created a clone of Trip in order to harvest his brain tissue. That has been the only episode of Enterprise to make me cry, and I can only assume it's because Sim (Trip's clone) wanted so badly to live, but Archer only wanted him to die. I haven't been impressed with season 3 so far, and I'm on episode 16.
I didn't care for the series finale of Enterprise either. It really was a ripoff! You'd think they'll come up with a better idea for something so momentous as the founding of the United Federation of Planes. That was horrible.
In a Mirror, Darkly is something that the entire series could've done without. It added nothing to it and it was just stupid.
The only thing I guess I feel different about it from AK is that I did like most of the episodes of the 3rd and 4th seasons.
Used to love Star Trek. Don't really watch it anymore though.
I haven't seen the Enterprise one, but I do like the ToS one.I kinda/sorta watched the TOS episode "Mirror, Mirror", and could appreciate it even more after watching the Enterprise episode "In a Mirror, Darkly". Only I liked the TOS version much much better.