S2 was all over the place. It produced triumphs like "Deadlock" and "The Thaw". It also produced travesties like "Threshold".
You want a season that was all over the place in terms of quality? VOY season 6.
This was how each week went... good, great, okay, great, good, okay, good, great, meh, good, very bad, bad, excellent, terrible, bad, great, awful, terrible, meh, meh, horrible, okay, good, good, okay, horrible.
No consistency in quality at all... the most schizophrenic season of quality ever. And the season premiere, "EQUINOX, PART II", should have been the first clue as to what we were in store for this season. Janeway starts off on her obsessive mission to get Ransom, an obsession so consuming she relieved Chakotay, threatened to do that with Tuvok, nearly got Crewman Lessing killed just to get information, and told the aliens she would be selling out the
Equinox. But when Ransom appears on the screen near the end, she suddenly says, "He may have forgotten he was a Starfleet officer for a minute, but he remembers now." Or words to that effect, and is softened up on him. She went from going full Ahab to a reasonable person with
no explanation shown. Janeway was written inconsistently throughout the series, but she was never this wishy washy within
the same episode. No wonder Ronald D. Moore left after less than a month on staff. (And I will always make the argument that he would have made things much better for seasons 6-7. Just look at the one episode he did for VOY, "SURVIVAL INSTINCT", as proof.)
Now, no season in the franchise is without its misses (except DS9 season 4, where only the A story for "THE MUSE" was meh... the entire rest of the season was pure gold), and while I don't think "THRESHOLD" is anywhere near as bad as people say (though the last 5 minutes
does bring it down a lot), season 2 did have a few bad ones. Which is no different than virtually every other season in the franchise. But VOY season 2, I think, had more good than bad in it.