So, having playing Vanguard's SP, MP, and Zombies my thoughts are as follows:
The MP gun stats on several weapons seem to be dead wrong based on different attachments. That stock or whatever you plugged onto your Rifle that SAYS it nerfs ADS time? Well...it does for you sometimes, but it is always lightning fast in the kill cam or if you made the game winning kill. Also, holy crud the amount of quick scoping is toxic! I'd really like it if on a close quarters map, I wasn't being one-shot by Three Line Rifle (aka Mosin Nagant) or 14.5mm rifles every other death from SMG or less distance...while I'm hitting them with weapons fire.
Zombies is fun...if lacking a bit more content and not really rewarding team play. Also, if you ran into people in CW trying to rush through the regions in Outbreak to have teh leet high score of round without regard to how their teammates can't fight anything because they keep pushing before anyone has perks or pack-a-punch..I have bad news (at least on the PS4 / 5). Out of an average 10 rounds of play (i.e. everyone dies or extracts ending the mode), 6 or 7 have the "I must get leet kills for my montage, and then complain when no-one helps me after I'm downed" as 2 of the players (out of 4) in the game. This is frustrating, because Outbreak HAD those people, but it was a 1 in 10 round encounter.
SP: The historian in me cried, repeatedly. Nice to see North Africa after it's been missing since the CoD2 days. While I know CoD is over-the-top with story telling in the past...this was like a game dev gave the story-line and battle setup to a 12 or 13 year old edgelord supreme who knows of WW2 only from BFV or a boring chapter in their classes. Was it fun? Sure. Would I replay it? Nope...watching many of the "MC is center of action, despite hundreds of thousands of people fighting on each side" hurt a ton, the Midway chapter especially. Last bit: if Vanguard wanted to go for a "super commando / soldier" team of multi-nationals, they missed the joint US-Canadian 1st Special Service Force, just about any of the US TD battalions from Torch onwards, Marine Parachute infantry, SAS, LRDG, and SBS services, and tons more that would have had SOME historical basis (also, some of the things accomplished by the listed groups feels like it came straight out of a AAA block buster action movie / game).