Traps
If Haypi made a few changes to Traps, they could actually be a VERY useful tool in city defense.
First - Increase the Damage Traps Do. If they did more damage, at least CLOSER to Turrets, more people would use them.
Second - Make Traps Invisible on the Attack Screen AND War Reports. Unless a Trap is Activated, attacking troops should NOT be alerted that the traps are in place
Third - Make Traps Immune to Defense. Trap Damage should be done based on Life Only.
Forth - Make Traps Random on the Battlefield. It would be nice if you had traps, they would randomly appear in different places on the battlefield. This would be a HUGE advantage as it would make the attacking troops pause at different intervals.
The first Three changes are Must Haves in order to balance the power between Traps and Turrets. The Third would make traps an integral part of every defense in the game.