DS9's arcs turned out reasonably well. That's not a given, considering that other show's arcs became a complete mess sometimes.
That's certainly the truth. It's amazing how well the show turned out considering it had so many arcs and serial elements, but not very much pre-series planning for those arcs. I think the stars all aligned wonderfully for this show. The cast, extended cast, the writers, the producers, the designers. Together they created something very special. It may not have been a ratings rock star, but it's a series that they could all be proud of. DS9 holds up amazingly well and comes off as a saga that was planned out from the beginning even though it really wasn't.