Den defense... When a den is ready to be under siege it will wait for you to come defend it before it is attacked. But it's a giant pain in the ass. I dont like it. I lost a den and then just ran to where the leader was, killed him, and took it back. Stupid waste of time.
Other than that, I've loved every second of it. Bomb crafting is cooler than I expected.
I am disappointed in it too. It's just annoying. I also hate that when you lose and have to take it back, you are automatically notorious after killing the leader again . . . which just makes it more likely that another Den will need to be defended. I'm working hard to rank up guys to Master Assassins so that I don't have to worry about the Dens.
The game is fun though.