But they're not, they 60 quid because that's all that's on the disc, maps
If there's no Single Player or even Co op story then they are shipping a Disc with maps for us to entertain ourselves with for 60 quid
Instead of 60 quid worth of entertainment and some mp maps as an extra.
It's an arbitrary comparison.
One person may derive more enjoyment from the multiplayer and not value the single player at all.
One person may value single player content more and not see value in the game as the result of a lack of single player content. Both are perfectly fine with their opinions
To make the point even more irrelevant, a studio is given a budget at the start of development. They can split that budget in half and devote their resources to both single player and multiplayer modes, or just focus all of their budget on multiplayer.
Personally, I would prefer if developers of these popular multiplayer games such as Call.of Duty, Battlefield, etc would devote all of their resources to multiplayer rather than put out a subpar single player. Obviously others would disagree, but ultimately it's up to focus groups and the publisher to determine how the budget is utilized.
At the end of the day, you are going to buy the product or not, but you can't form an argument for entertainment value based on subjective opinions.