This game is what the other Splinter Cell games were, "freakin sweet"
The multi-player can get pretty addicting because you are taking on actual people and that's really where your skill comes into play because the human opponent is unpredictable. Some faults include in solo mode Sam Fisher tends to get stuck in some corners and needs some time getting out which could screw up your gameplan when it comes time to attack.
I suggest getting this game because it's the only one of its kind and it's just flat out a good game to add to your collection. And the preview in Splinter Cell for Ghost Recan Vegas is pretty sweet but you can get that anywhere.