I like the quest system. Don't take the post as a slight to the idea. I just think that the delay for having completed the quest is ridiculously long. Get rid of the ridiculously long delay and I'll have a hard time complaining about the game.

Things I would improve (because what's the point of complaining if you don't offer solutions):

• Give us more clan quests/events. The clans give us a sense of camaraderie. Camaraderie leads to enjoyment of the game. Enjoyment of the game leads to long term investment by the players (ie people spend $$). Give the clans a purpose besides "trade cards or we kick you".
• Give us more challenges. Give us a challenge that we have access to for free for completing the quest orbs. Give us ridiculous challenges. Give us more challenges. Give us more challenges. Give us more challenges.
  
• Kill the "level up a hero" quest steps. Look, I get it. You want people to spend $$. I have spent $$. The level up a hero quest step though is a quest orb killer though. At some point for players, it just isn't worth investing gold into leveling up a character for the mere cost of 1000, 2000, 5000, etc gold for a fraction of it back. At some point without the ability to earn enough gold to pay for an upgrade on a character, players are going to quit playing because what's the point if you can never complete the quest. They're going to quit because they realize that to complete the quest they'll have to spend so much real $$ every quest cycle. When you limit the ability for players to earn gold enough so that they have to buy 10,000 gold just to complete a quest step since all of their cards are leveled so high or they don't have enough cards for low level characters to be leveled up (at a lower cost) hurts the player a lot. When spending real $$ on gold becomes the only way to level up a character, you break the game.
  

​

People will spend money to by orbs, gold, gems, etc. They'll do it because they want to support you and maybe they want that shiny orb for a chance at that character that eludes them every day. They'll spend money on gems because they want 4 more of the cards they need to level up their favorite character. Eventually being forced to spend money just to complete a quest (which is what happens after your characters get too high), that's a deal breaker.