A quests should give EXP to party characters that are still below or within the associated adventure level. So, if my characters do not get good loots from the quest, they will still earn some EXP. It's frustrating that my characters completed quests and then got BS loots for the efforts. Honestly, useless loots are just useless because they sell for miniscule amounts of gold. The characters should have at least gotten some EXP -- in fact, they should have gotten MORE EXP than just completing regular adventures -- as a consolation.
There are already several threads on this topic. No need to make a new one: I'll link Sir Knight's Megapost on this: http://forums.cardhunter.com/threads/suggestion-award-xp-for-quest-completion.2760/#post-28774 As well as this: http://forums.cardhunter.com/threads/question-quests-and-xp.1763/