When it comes to Harry Kim... I'm now convinced they were just being an asshole to Garrett Wang. There's a story there we're not being told about.
That's how he felt in a 2011 interview.
Another odd turn, in my opinion, was the non-promotion of Ensign Kim. I mean, come on people! Kim was probed, beaten, tortured and held the distinction of being the first Voyager crew member to die and come back to life. What more does a guy have to do to get promoted to Lieutenant for frak’s sake? To add further insult to injury, other crew members such as Tuvok (Russ) and Paris were being promoted, demoted and then re-promoted throughout the seven-year run of Voyager.
I'm not trying to be negative here; just saying it like it is. During the fourth season, I called writer/producer Brannon Braga and asked him why my character hadn't received a promotion yet. His response? “Well, somebody's gotta be the ensign.” Geez, thanks. Thanks for nothing. At some point, I even approached Kate Mulgrew and frustratedly asked her why I wasn't promoted yet. In hindsight, this action on my part was hilarious because Kate Mulgrew had no more influence in promoting my character than a random person on the street. I would like to take the time to say that I had no influence on these Kim developments.