I agree with what others have said here.
Ezri was a good character, played by a good actor (much better than Terry Farrell IMHO), and a good addition to the final season of DS9. She's unfortunately not remembered fondly because her focus episodes were mostly not good. Afterimage was below-average, and Prodigal Daughter was absolutely terrible. Field of Fire was the only one which really gave us anything interesting, or even watchable.
Jake was great - in a lot of respects I'd argue he was Wesley done right - a kid just allowed to be a kid. While he had his off episodes - like The Muse - he also had fantastic ones like In The Cards. Cirroc was criminally underused in the later seasons for some reason. I don't understand why anyone would be annoyed by him.
Chakotay could have been interesting as a character, but I think the original conception was doomed because Voyager's "expert" on Native American culture turned out to be a fraud. Also their decision to back away from any Maquis-Federation conflict almost immediately turned him into a weak yes-man for Janeway. Still, they could have done some interesting things with him, like play up the sexual tension hinted at with Janeway a bit more. Or have him be a dick to the crew - that's part of an XO's role after all - be the dick so the Captain can stay more above the fray. But as a character, he turned out a failure.
Kim was in contrast I felt a relatively well-rounded character. The problem was his character was being a wet blanket/greenhorn, and Voyager's steadfast insistence that no characters grow and change over its seven years meant that he - implausibly - was still acting much the same by season seven. It didn't help that Wang was probably the weakest actor out of the Voyager cast, and every time they attempted to give him a focus episode he tended to flub it.
Mayweather was, of course a joke. But every time they tried to give Anthony Montgomery a more substantive role - a bit of focus, like when he ran into other boomers - he showed he just didn't have the range for it. He was a mistake in casting, and eventually they realized it and started treating him as just an extra.