I must admit it is a fresh change. With a decent host it could be a whole lot of fun with a few of us. Portals + constantly shifting gravity + sneaking out of your body = hilarity. I'll hop on my 360 now, if anybody wants a game send me an invite.
From watching too much Stargate, I hereby announce the Iris Manouvre. Fire the gas cloud through it, run through, turn and throw a bug grenade at the guy camping behind the portal. :fite