More often than I'd like to admit.
Watch_Dogs- worth it. T-Bone campaign and Conspiracy were both very fun, plus the extra preorder outfits were snazzy.
The Last of Us- worth it. It was one of my most played MP games last gen, so it was nice to get new maps and items. Still haven't played Left Behind.
BioShock Infinite- not worth it. Wasn't a huge fan of Burial at Sea unlike most people, or else I would have thought it was worth it. Something about BaS just fell flat for me.
Shadow of Mordor- not worth it. Celebrimbor campaign sounded so cool, and it ended up being a huge let down.
Destiny- I spent an embarrassing amount of time in PoE, so I guess it was worth it.
So I basically have a 50% success rate with these things. Already bought AC Syndicate because the Jack the Ripper stuff is intriguing, and I'm debating on Dying Light and Battlefront. If Battlefront has Clone Wars era stuff it'll become a must buy since I love the clone designs from the PT. Tempted to get Blops 3's for Der Riese but I don't like the game that much.