Its an amazing game.
Story and characters 10/10.
Music and sound too.
Graphics is better since it's PS2 than the previous titles.
The gameplay, however varies.
It's not difficult, you have plenty of ammo and such. The character switching parts not always smooth, sometimes you don't have a fail safe supplies, or just not enough when you become a different character. And also, it's really repetitive to replay parts of the same map with different people