Please recommend me good and long ps3 exclusive games

[Pock3R]

demon's souls is a must

for a 4th game i'd go with either killzone 2 or mgs4

mgs4 if you want more single player because you can have fun beating it 3 times at least, even tho i put 100s of hours into online
killzone2 if you want more multiplayer even tho single player is a decent length.