The 360 hinders what can be in the game due to the xbox live and the hd-dvd so it isnt the same and As long as the online still kicks ass it will be good
am sorry but what the hell has Xbox live got to do with CO-OP if anything it would be better on the xbox also it has nothing to do with the media its on as all xbox 360 games to date have not used the full 8+GBs of space so typical fanboys putting down a game based on there own hypocritical thoughts.
most likely the reason it was dropped was because as they stated it took away the experience we were aiming for but also they may not have had time to write a new plot and story for CO-OP they do have time limmits to work by and since MP is now the big thing they would have wanted to spend more time on this side.
also if they did release it with a half arsed CO-OP no dough you would be in here moaning that its crap and why did they put it in.
at the end of the day this game is going to rock in SP and in MP as long as the hackers stay out.