Multiplayer: The multiplayer in this game is horrible and completely unbalanced. There is no point in even using some guns in this game if you are just gonna get 2 shotted across the map by an SMG or an AR. The weapons are completely unbalanced and trust me, this can't be fixed. Some maps are good, such as Hotel Royale, Eagles Nest and Das Haus, but unfortunately, Das Haus is plagued with shotgun snipers and riot shields. The multiplayer is worse than MW19 and that's saying something.
Campaign: The campaign was extremely boring and has no replay value whatsoever, unlike Cold War where they had 3 different endings, side missions, intel, calling cards and much more. I always find myself going back to a campaign mission here and there between a cods life cycle, but this game just doesn't have 1 single fun mission.
Zombies: Yeah, zombies are just completely boring and need content desperately. The zombies mode has a good base foundation, but the lack of content brought the game down dramatically. I feel bad for Treyarch, as they were forced to finish the sledgehammers game (sledge was originally making cold war) along with making zombies for them as well. When zombies get a round-based map, the game could be fun.