When I look at the list of episodes in the third season:
I like "The Swarm" but I don't that it was undone so quickly. If you're not going to stick to the Doctor losing his memories for a little and if you're not going to make it take real work to get it back, then don't bother to have that subplot in "The Swarm" in the first place. In isolation, it's fine. In the bigger picture, it's not.
"False Profits" is VOY taking everything I can't stand about TNG Ferengi and amping it up to 11.
"Coda" feels like five episodes of TNG strung together into one with an evil demon ghost pretending to be Janeway's father. Some good scenes, especially at Janeway's "funeral" aren't enough to make up for the episode overall.
"Favorite Son" is a terrible episode, but a Guilty Pleasure. I'll list it here anyway because, even though I enjoy it, I acknowledge it's bad.
"Real Life" has a sound premise; the only problem is that Torres waaaayyyyy overcorrected in trying to make the Doctor's holo-family less perfect. Talk about going from one extreme to the other. If the Doctor pushed back and they found a way to come up with a happy medium and the Doctor learned something from the experience that was able to use in Sickbay somehow someway, that would've worked better.
So, there are only five episodes in the season that I have some sort of issue with. The other ~80%, I'm fine with.
I know "The Darkling" isn't on here. It's not a favorite of mine, but I also don't have a problem with it, and I get a kick out of watching Bob Picardo act out all those different personality types.