I thought Chakotay had a major role in some good episodes of Voyager. I enjoyed him in State of Flux, Initiations, Maneuvers, Basics I and II, Distant Origin, Unity, Scorpion I and II, Nemesis, Year of Hell I and II, In the Flesh, One Small Step, Timeless, Shattered. Of course, Chakotay had a lot of bad episodes too. He was just written inconsistently on Voyager (which was a problem with show in general).