I think it is fair to say that BJJ is not effective against 2 opponents, that is why I try to stay standing. I have taken on two people on more two occasions and have been fortunate both times as one of the combatants has found things a bit rough and run off each time, leaving the other to my mercy.
But just because BJJ doesn't claim to have any great chance against 2 opponenets, it does not necessarily follow that other arts (that claim to be useful) actually do give you more chance.
I think the best way to fight two would be to take one out immediately with a shot to the eyes or something. You should be able to justify it, hopefully.
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