What ShakenBake said its true, Going speed rook is losing rooks advantage all together, i mean whats the point of going speed if you still need a stunned enemy to hit hammer slam or you need an enemy in your tower farm to be able to win.
Rook is not about where you can go but where you can make the enemy go, and when you are slow and you are running they seem to get this false confidence and just go and atack you, i prefer my slow rook, speed dosent give me any good advantage and im sacrificing a slot for my BotF and money for my armor/hp.
I hate to say it but people that go rook speed are noobs, cause they will always outrun you, going in a battle of speed against a sedna is tupid, she is the fastest character in the game, going against ub and erebus in a battle of speed is equally stupid cause they got 2nd best speed and also slows, and all other characters are the same you will always lose in speed.