From what I understand chum salmon tastes just fine, the meat certainly doesnt stink unless the fish has been rotting for a while. They are my favorite salmon for smoking but taste good cooked with any recipe you would use for other salmon species. The key would be to only take home fish that are in decent enough shape, make sure you bleed your catch right away and try to keep the fish cool until you get home. If you kill a fish and let it sit on shore for a few hours its bound to effect the flavour of the meat no matter what kind of fish it is.