BO4 is pretty weak. By March of 2019, 52% of xb1 players gave it 1 star (out of 5) on the xb store (check it yourself).
Multiplayer is meh, mostly repeat maps. Nobody wants or needs Firing Range or Nuke Town back. Otherwise, it returned to more traditional CoD battles at least.
Blackout. Yawn, next. Nothing new or innovative. Even boring BFV's BR mode appears slightly more interesting. It needed something, but it offers nothing.
Zombies are dead. I've played since WaW's first dlc dropped. BO4's zombies are a boring zombie knockoff mode that is so boring that I'll type boring thrice in this sentence to make the point. Do you love Treyarch's zombies? Then do not buy BO4, but if you do, then write and tell them how bad it is once you find out. I played it for weeks, hoping it held some value, but zzzzzzzzzz.
52%, 1 star. Well deserved 1 star. BO4 bombed, next.