Whether you want multiplayer or not is irrelevant- the DRM requires you to always be connected to the authentication server.
If your connection drops while you're playing, it kicks you out of the game even if you're in single player.
The weird thing is, Ubisoft are fully aware of how awful this system is, as they always end up removing it after a while, saying they're paying attention to their fans... then announce that they're putting it in their next game anyway
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"My name is Ezio Auditore da Firenze, and like my father before me, I am an accountant"
Nothing is true. Everything is tax-deductible