It's hard to judge VOYAGER seasons, at least the first 3, properly for one basic reason.
UPN.
I say this because seasons 1 and 2 had four episodes each held over to the next season, and season 3 got shortchanged by not being able to produce four more episodes because of it, which is why VOYAGER ended up with four less episodes than DS9.
An example... "PROJECTIONS" was an excellent episode, and it would likely give season 1 a better score overall by most people had it aired as produced. "THE 37's" works far better as a season ender than a premiere, which definitely would have given better closure to the season than "LEARNING CURVE".
And while I can understand the reasoning behind pushing "BASICS, PART II" back as a season premiere, leaving a cliffhanger season ending, and holding over "FLASHBACK" due to the Anniversary, they didn't have hold back "SACRED GROUND" or "FALSE PROFITS"... the former being the far better of the two. And besides, regarding "FLASHBACK", couldn't they have simply produced it in early season 3, like DS9 did with "TRIALS AND TRIBBLE-ATIONS"?
(Side note regarding the episode holdovers: I remember reading that UPN did it so they can get a jump on the new season ahead of other networks. Okay, I can behind that logic. But they aired them completely out of order, mixing up both seasons.
For instance, season 2 started with a season 1, then a season 2, two season 1s, a season 2, then the last season 1. Why not just air the season 1s in a row, THEN start with season 2s? It's especially glaring here versus the season 2/3 ones because of the font change with the episode titles and credits. They really thought fans, or even casual viewers, wouldn't notice?
Then for season 3, we get... two season 2s, two season 3s, a season 2, a season 3, then a couple weeks of repeats before the last season 2 holdover.
Clearly, several episodes are already finished by the time the network wanted to jumpstart the season, so why didn't they just air them first and keep the episodes within their produced seasons? We might have gotten a full season 3 otherwise, which frankly would have made it better overall... the first and last six episodes were great, while the middle was mostly... meh. I think we would have gotten really good extra 4 episodes.)
Having said all that, here is my personal ranking...
Season 1... as aired, not bad. I feel it's better overall if you watch the produced ones heldover with season 1 instead of airdate order.
Season 2... it gets more hate than it deserves. It had some genuinely good ones... "PERSISTENCE OF VISION", "MANEUVERS", "RESISTANCE", "DEATH WISH", "ALLIANCES", "MELD", "LIFESIGNS", "DEADLOCK", "THE THAW", "TUVIX". They dabbled with arcs here, and while using the Kazon as the subject matter was a poor choice, it was a good idea because of all the STAR TREK shows, THIS is the one that should have been the most serialized. I think the series could have been even better if they just kept trying what they were doing in this season.
Season 3... personally, only season 7 is weaker than this one. I say this because we got 6 good/great episodes in the beginning... "THE CHUTE", "REMEMBER", "THE SWARM" (The Doctor story was the better of the two plots), "FUTURE'S END" two-parter, and "WARLORD"... and the 6 at the end of the season... "BEFORE AND AFTER", "REAL LIFE", "DISTANT ORIGIN", "DISPLACED", "WORST CASE SCENARIO", and "SCORPION". The middle of the season was... middling. VERY hit or miss with them.
I would say seasons 4 and 5 are the most consistent. High concepts, good stories overall for both. Introducing Seven was a great choice.
Season 6 was like a rollercoaster... really good highs, very bad lows. My favorites... "SURVIVAL INSTINCT", "TINKER TENOR DOCTOR SPY", "DRAGON'S TEETH", "ONE SMALL STEP", "BLINK OF AN EYE", and "MEMORIAL".
Season 7 just felt kind of like the middle of season 3 for me. Weakest season of the series.
I should also note that VOYAGER, with the exception of the first two seasons of TNG and DISCOVERY, went through more changes in the writers room than all other spinoff shows, particularly the ones in charge. I don't think it's a coincidence that this series feels more uneven and inconsistent than other spinoffs. That should be taken into consideration when trying to rank the show, for fairness' sake.
This post ended up being FAR longer than I expected, so please forgive the info dump.