OK, I played some more and;
Enemies DO spawn right in front of you sometimes, oh how I hate that.
Team-mate AI; twice in one level my fellow ghost threw a grenade against the wall right in front of him, killing himself both times, aaarggh! He also repeatedly walks into my line of fire.
The slowdown in the 2nd level is more than I've seen in any GR game.
The auto-save totally interrupts the flow of the game.
IMO many of the objectives are confusing, there is a lot of trail & error (you die alot), to figure what to do next.
Still cannot find any co-op types other than the missions. Even in SP quick mission mode there are no other game types but the mission (correct me if I'm wrong), unlockable maybe?
I have to assume than the Co. that programmed GR2 & SS had nothing to do with this version because so far I think this is a step backwards especially in fun-factor.
Again, just one man's opinion...