black on PS2, I loved how realistic it looked at the time and the explosions, god was that game so fun
Timesplitters on PS2 because it was the first game I got and the goofy cartoon animations were fun
SOCOM 2 US navy Seals because I thought the game was so immersive using a headset to communicate to your fire team (I know this is a bit more gameplay but the graphics help create the immersion)
Front mission 3 on ps1; who doesn’t love mechs blowing each other up
Lastly would probably be Metal Gear solid 2. I still think it’s a good looking game
A few come to mind