I keep hearing people talk about towers being to easy to take down. I hear people say that they can be exploited by the rook placing a tower near the enemies tower, walk away and let the enemy tower target the rooks tower. Then the rook can go in and attack it without being attached by the tower. From my experience, once a player gets to level 10, towers are like mosquitos. They are merely a nuissence. Even when upgraded, they are still a joke.

I think towers would become much more effective if the tower upgrades were to do more then add damage. Here is my idea

Tower Upgrade 1: Tower can shoot at 2 units at a time instead of one. Increased Damage.
Tower Upgrade 2: Tower can shoot at 3 units at a time instead of two. Tower slows target by 5%. Incrased Damage.
Tower Upgrade 3: Tower can shoot at 5 units at a time instead of three. Tower Range increased. Increased Damage

Towers should have an attack priority. Demigods should alway be the first target. When a tower can shoot at multiple targets, one of the shots should concentrate on minions. Note that the incrased tower range upgrade will allow the towers to shoot at catapolts allowing the towers to defend against them. Also note that if only one unit is in the towers range, even with the max upgrade, it still only does one shot.