The multiplayer is quite good, actually.
It's sorta deathmatch, but with being able to research, upgrade, earning money, ect, between games played.
There's police men to be aware of and pedestrians/cars walking/driving around. You use cars/trains to get around.
When you lose all of your 1-4 hitmen, you'll lose. Or win.
There's, I think, 1-8 levels to choice from, and you can play 1-8 players.
Not being able to see through buildnings is probably an issue, probably more so than singleplayer. But you'll might be able to accept that. You HAVE to use scanners!
It's relative easy enough to setup for multiplayer:
http://syndicate.lubie.org/synd/html/synd_run_mulplr.php Also
http://freesynd.sourceforge.net/index.php (*Engine port*. I hope they'll add multiplayer with camera rotation, partly transparent buildnings. If so, I'll be pretty sick.)
:)