I made up 8 10-card decks to suit character archetypes:
Defender 1
Defender 2
Melee Striker
Ranged Striker
Controller
Leader
Misc Support (the "anybody can use these" deck)
Chance (all the Gambler cards and Reckless cards)
At my three groups (DMing LFR, DMing home game, playing home game), I've handed the decks out to appropriate PCs and we've given them a whirl. So far, I've had inconclusive-to-positive results. I gave them to my LFR players, and they seemed to like them. My other two groups forget to use them for the most part, but in one of those cases we're all learning new characters right now, so also learning cards is a bit of a hassle.
They don't outright hurt anything, though, so I'll keep giving them a shot.