This is for how to counter Rook players who know what's they are doing.
Group up and hunt other demigods to get more gold, buy stuffs to outlast the Rook.
I am not kidding.
See, Rook is pretty much immobile; he won't go outside of his forest of towers. Thus he cannot help his mates at all, unless they choose to go into the forest of towers. Most maps are huges and many points availeble, that Rook alone cannot dominate all points at once.
Not to mention the enemy demigods you will encounter are always outnumbered by your group as well.
Only exceptions are exile (only two choke points) and Crucible (only ONE choke point).... You are pretty much doomed againt Rook(s) unless your side also has a Rook player.
But again it does not mean that towers are op or broken (personally I think they are fine since disadvantages mentioned above.)
Upgrade building health and damage at your base and the advancement of Rook will be slower as well.