If you get the stun gloves on reg you can own rook a lot easier. Making how much damage he can do not as important. The slow+stun allows you to kite him indefinitely as long as you can dodge the stun (and the range you have gives you enough to do that). The only problem is that it only takes 10s to cd so dodging it everytime is impossible. And once oyu get hit, its gonna be bad. Double it and if you dodge it 1x/2x that should be all you need to do before he dies.
The damage on rook is meant to be like that. You're not going to be hitting for that much until late in the game where other characters can have just as good items to stop you. I've played games where I was hitting 2200 damage on towers and taking them down quickly, but they had dual stun glove regulus that could pretty much own me as soon as one of them could hit me (even one of them could drastically slow my dps by stunning). Sure you have wand of elusiveness, but that even more money making you effective even later in which case they could have even better items.
If we are going to start balancing don't do it the stupid way. Where you just look at everything and say wow, such and such ability is really strong. When in fact its not that ability but the combination of his abilities. If you nerf stun, the 200% damage isn't going to be as big. If you nerf damage, the stun isn't going to be as big, ect. So just nerf one thing at a time until the balance is achieved, don't just nerf 5 billion things at once then have everyone complain next patch that rook sucks. Because if you nerf GS, boulder, AND hammer, rook is going to suck.
-BlueFire