Ron called me friend.
Sofar, the only issue for the MP (besides the limitation in the levels for MP) is that the adversarial difficulty doesn't adjust to allow you to complete the missions with less agents active.
First time on the first level with the two of us and we managed to clear it out without too much difficulty. The last boss killed us once or twice - because there are only two of us, the "frozen tag" is more challenging. (revive fallen members without anyone to distract the chaingun-wielding boss).
The second time we played it, I think it took us at least 10 times. Random spawns and experimentation were the real challenge, IMO. Not having enough agents meant you really had to be on top of the combat without any deviation.
I'm not going to steal Ron's review thunder, but suffice it to say that it IS a great multiplayer experience with caveats, and while I have concerns about it, the switch to FPS does the Syndicate mythos justice. If they sequel it, they really need to step some things up.
Ron, if you sign up a dummy account, I'd gladly continue the MP testing...