I think quests could be improved in many ways. Here are 3 improvements that I think could benefit quests greatly.
1. Visible QP balance
Currently, you can only view your QP balance after you complete a quest, but I think that clicking on the Quest Master or doing /quest should show your QP balance.
2. Quest Complete Sound Effect
Currently, there is no sound when you complete your quest. There is only a pop-up in the chat, which can easily go unnoticed when in a heated match. I think that there should be a little sound that plays when you finish your quest to accompany the chat message.
3. Quest House Teleport Option on Compass
Currently, the only way to teleport to the Quest Master in the Quest House is to go to the NPC in the lobby. I think there should be an option to tp there in the game selector compass just like there is an option to go back to spawn.