Newbie question.
How often do you use the quest cards ? Some of them can be pretty powerful but others don't seem that worthwhile depending on the game. Since it takes a while to trigger their effect I usually end up using them as developments. What's the best strategy to use them ?

They are a good way to draw fire from another area, if it's a really good quest. I don't have any at the moment because I'm running a large (85ish) Empire deck and I don't need to throw in any more cards unless I know they will be used. I you're deck doesn't put much in the quest zone naturally, I'd probably stay away from them. Quests have a tendency to make you want to put a guy in the quest zone when you know he'd be better defending your kingdom. I'd probably play with everything the same in your deck and just try playing with and without the quests that you like and see how it goes!

I haven't had much use for quests in any of my decks, primarily because I play with/against very fast swam kind of decks, so there is never enough time.

Seems like there are a few neat quests though.

ive never used a quest to b honest...
unless i get them early in the game they just become developments for me....
they take to long to develop and play with or agenst agressive decks