Just because we aren't as fond of some of the games as you doesn't mean that it's "obvious" we haven't played them. It's entirely possible for people to have different opinions about a game than yours.
The first Splinter Cell was good enough for its time,
There's one thing not being very fond and calling the other titles in the series ''terrible'' and ''forgettable''.
That's just plain wrong no matter how you put it. The first Splinter Cell was ''good enough'' for it's time? Please it was absolutely outstading at the tiem and so are the other games in the series prior to Conviction.
Just because Chaos Theory it's this series peak that doesn't mean that all of the other 3 fantastic games shoud be skiped. The first one is debatable and has some aging to it but there's no reason to skip Pandora Tomorrow or Double Agent on PS2/Xbox.
They hold up well enough.