I haven't said anything in this thread yet, which is surprising since I really enjoyed the first three Splinter Cell games (haven't played DA). I played them on the X-Box, not PC, if that makes any difference.
It's sad that there weren't more Metal Gear Solid ports from PS2 to the X-Box (there's only one that I know of, MGS2-Substance). Splinter Cell, however, helped fill the void for me. You can play Splinter Cell your own way too. Getting the job done really stealthy, taking out each enemy guard by close-quarters throat-slitting, or you can just load up on lethal ammo and blow away anything that moves (although, some levels reprimand you for not being stealthy).
The stories aren't too bad in any of the games. They are usually action-packed and somewhat political in premise. They also have some role-playing decisions, and maybe some plot twists.
When it first came out, Splinter Cell's graphics made my jaw drop, and they are still pretty decent now.
Overall, a good bargain-bin purchase.