You can just pile in with anyone really. Loads of randoms keep sending me invites as well. Or you can just ignore them all.I have to admit, I'm tempted to chuck this in while it's still worth a few bob. I can see that it would be fun playing a co-op, but I don't really do that, or have anyone I know to do it with.
I keep thinking it might not be that great as a single player.
I saw Raiden was on it just now so piled in with him and his mate and we went round doing some stuff, it was good fun with others tbf. I'm liking it so far.
It's basically a cross between Borderlands and Mass Effect, but not as silly as Borderlands and not as serious as Mass Effect.