Question about Co-OP
 

I was curious upon how CO-OP work, a friend and I are looking to buy this game, but we
are wondering how much CO-OP playability is in the content right now. All your help is greatly appreciated!

Welcome to our forums. You can play CoOp Siege and CoOp Quests. You can either do CoOp with a random player willing to join you (search is automated so you don`t have to ask anyone), or you can play with your friend by inviting him in-game to join your CoOp Quest or Siege.

Not sure what else to say about the CoOp mode - it`s fun to siege a huge castle with your friend.

Thank you for that information! Is there many CO-OP quests to work on together? Or is it fairly short? Are they always adding new quests?

There are unlimited number of co-op quests, unfortunately they do get a bit repetitive after a while - your basically either attacking a town together, or fighting against an army together.