...was that they finally got the Vulcan make-up to look right on Jolene Blalock. It was very hard to look at her with that nappy wig they'd throw on TNG's Vulcan guest stars, for so long - and take her seriously, in it. It always seemed like the show never took her seriously, always asking her to take her top off and not really developing T'Pol as fully as she deserved. But no matter ... outside of a couple real stinkers, I think the third & fourth seasons of ENT are great STAR TREK in its finest tradition. It's most enjoyable.
Totally agree about the "T'Pol look" in season 3. They got it spot on I thought and while the colorful catsuits were nice, it was the hair that set her off for me. (as if I needed something more to set me off
I did a "stinker comparison" one time comparing ENT to the other series. I found that it had less that the others in the 1st 4 years of their run. Some of the others had more higher ranking episodes, but more stinkers as well.
But I'm a fan of the entire series, I'm sure others' results will vary.