Tier list of all CoD I've played enough. Important note – I judge CoDs from MW2 to Advanced Warfare based on SP, MP and co-ops, new MW trilogy and BO7 based on SP and MP. The rest is only judged by the SP.
GOAT: Almost everything is pretty much self explanatory. Except MW2019. Sorry, I just love this game. The campaign is great (Clean House, The Embsassy and Going Dark are awesome). Last month I finally gave multi player the chance and wow. It's way better than I expected. Not at sweaty as MWIII or BO7, but still engaging. A good balance between the old and the new. Yes, maps aren't the best, but everything else make up for this.
Fantastic: Again, MW3 being here is kinda obvious. SP is just not as good as MW and MW2, but the MP is (alongide BO2) is favourite of the series. And I have so much great memories of me and my school buddies playing the co-op every friday.
MW2 remaster is so low because it's only SP.
Now, Black Ops Cold War has really good campaign. The cold war paranoia strikes back. Not as good as Black Ops 1, but still awesome.
Great: I really like WW2 campaign. Only two things didn't work: Daniel's past trauma (I think it just wasn't necessary) and France as the only place. I wish we at least got Liberation of netherlands and fignting in the Third Reich.
MWII was a decent sequel. I like both the campaign and multi player, but I think MW2019 was better. Still fun.
BO6 also was fun campaign-wise.
Good: Infinite Warfare could be higher perhaps. I love the campaign. Levels, characters. But the villain is just so badly written.
MWIII – worst single player I've played (besides BO7). Plot was ok, but the levels were awful. Especially Open Combat Missions. But multiplayer is fun as hell.
Mid: Ghosts is my guilty pleasure. Campaign was fun, I love level design in that game. Multiplayer – it just was. For me it was mediocre. But I liked playing it.
Advanced Warfare – very fun single player. Great villain, but exo suits there are under used. It had great potential. Multiplayer wasn't that great, it's the reason I didn't touch CoD multi player for the next 12 years.
Bad: Vangaurd just don't have any redeeming quality. The villain and plot were just meh, main characters are overdone and each of them habe too few missions to really flesh them out. The only good thing is we got all major WWII fronts in one game.