i agree that i don't give a crap about storylines in games. if i want a good plot i'll go read a book or watch a movie. i play video games for the experience, not the story.
however i do believe that the ending sucked, the game was to short, and they changed up the entire single player & multiplayer experience.
single player, as was mentioned above, doesn't have enough stealthy sneaking filled levels and multiplayer... well that's a whole other thread.
i do like the game, but sc3 still remains the best splinter cell to date.