Only buy BO4 for offline play if Zombies is your sole focus and you don’t care about unlocking items. For anything else, look elsewhere.
Black Ops 4 is a frustrating offline experience. Zombies is genuinely great and offers deep replayability, but the lack of any meaningful offline progression, no campaign, and the total absence of Blackout offline make it a hollow package compared to previous Black Ops games. If you can get it deeply discounted (under $15) and only want split-screen Zombies with friends, it’s passable. Otherwise, Black Ops 3 (with Zombies Chronicles) or Modern Warfare 2019 (speculative mode) offer far better offline value. Call Of Duty Black Ops 4 Offline Gameplay