'Redemption' in the form of him being able to kick back and relax with his friends even after everything that happened during the course of the game. He wasn't a particularly bad guy so much as someone who was messed up, taken advantage of and screwed over. I'll admit, I didn't particularly care much for Rinoa - she always struck me as annoying and a romance between Quistis and Squall would have felt much more natural to me. Or, ideally, a romance between Seifer and Zell.
I'm content that Seifer evaded death and wasn't killed off. I don't think stories need to make a point to make every character be punished for their actions, either - so I'm a bit disillusioned by the commentary from a vocal portion of FFXIV's player-base that seem to think that every single antagonist needs to die or be imprisoned because they may have done questionable things.
I do think more could have been done with Seifer, though. It's a shame he didn't end up becoming a permanent party member...even if it only happened during the late game. I guess he's like Beatrix in that regard.