Splinter Cell Pandora Tomorrow is everything Splinter Cell was and then some.
This game has pretty much everything the original had. Great graphics, awesome sound and immersion, and even more gadgets. Also, online multiplayer has been added, which Im not too fond of, but it is really popular in the LIVE community. I myself prefer some kind of co-op (you know this if you read my Chaos Theory review). I feel that the versus modes online stray too far from everything that made campaign so good.
Like I said, the online must be good, everyone seems to like it. Pick this up whether or not you've played the other splinter cells.