Although I personally don't "dislike" any fish, here are some of the negatives that I've seen noted on this forum concerning green sunfish.
1. Relatively large mouth size makes them a direct competitor with largemouth bass and other piscivores.
2. Fecundity and niche overlap make green sunfish a direct competitor with bluegill.
3. While competing with bluegill, green sunfish have less growth potential than do bluegill, thereby tying up biomass in smaller average size fish.
4. Green sunfish marauders will cruise spawning areas in the spring and raid nesting areas of newly hatched fry.
Positives that I can imagine include:
1. Green sunfish are able to withstand poor water quality.
2. They readily take artificial presentation, thereby creating angling opportunity when other fish won't bite.
3. Beautiful coloration.
4. If you can grow them big enough they have similar eating quality to other sunfish.
