There are a lot of Splinter Cell games, but the first may be the best of them. Though a bit rougher around the edges than sequels like Pandora Tomorrow, and lacking the fantastic soundtrack of Chaos ...
On the PC, you can get high rez and use FSAA and all, but on the PS2 (and other consoles), there's some depth of field effects that help it feel more immersive, and you don't get them on the PC.