I think it would suck if all 4 players started together. Maybe if there was teams of 2 and they had to communicate and work together to meet up and finish their objective. Maybe even have all 4 players start on different parts of the map, and all 4 players have to do there objective alone, but at the same time as the other 3 to move further into the map where they meet up.
@gamester - Friends don't let friends go rambo. The best co-op partners are always your friends, and not random people. Unless you pick up a few friends from the splintercell.com forums. Most of them are all stealth players, I have added over 10 people from there and have some of the best co-op partners you can get.
@T9X69- i play with someone i know in real life...and it is bad enough that he has to shoot out every light when i tell him not to (which alerts the guards) but when there is a actual fire fight he just tries to just go full rambo...ending up with us dying (3rd co-op level was not fun because of this...)
I can take umbrage,I can take the cake,I can take the A-train.I can take two and call me in the morning,but I cannot take this sitting down.-Hawkeye,M*A*S*H
The last 2 co-op missions where pretty difficult to stealth through, unless you and your partner are very good at stealth. I tried to stay as stealth as possible and avoid shooting lights up but there was a few points where I was pretty much forced to go rambo.