I hope I'm wrong about this but from what I understand these newer console ports are encrypted so that modders can't access and mod the games.
This is too bad because the games which can be modded last for years and years beyond what it should. From what I've heard, GB is one of those games that can't be hacked and altered.
This is bad news for the PC community.
However… I recently bit the bullet and got Xbox live. Ghostbusters is by far my favorite game. Long have I lamented the absence of a skirmish mode, but multiplayer basically is a skirmish mode.
So if you're sick of the single player (yes, I've been playing it for a year straight myself!) multiplayer will satisfy in many ways. There are a number of ghosts that are exclusive to multiplayer… so that will be exciting coming from the 56th time in single player!!