Ok.... God, I really didn't want to say this... Sorry, Neal. Gotta point out the obvious.
Maybe, just maybe... it's because they're not used to internet reliability (their connection, Ubisoft's connection, all the connections in between, Ubisoft's servers, firewall/security software, etc) affecting their single player games.
... Or was that obvious for everybody else? Just thought I'd point it out. I'll go back to being quiet now