I have been aware of running between the Rook's legs ever since the Nightmares did it to me a while ago. In both the Boulder Roll and the Hammer Slam, technically the best place to be is right on top of the Rook as both attacks are directional. However, the problem with this is that the Rook generally wins a slap fight. If he had lower base attack, then running around his legs would be a viable option. Unfortunately, you're bound to lose a fight at point blank range simply because he hits harder and has more health. Plus, he's probably going to hit more frequently if you are focusing on trying to run aorund. (Don't get me wrong. He's a giant walking castle. He's supposed to win slap fights.)
How exactly would I "manage the character's movement correctly"? It would make sense if he was slower, but currently the Rook is just as fast as any other Demigod. Managing my character correctly would make sense if there was some way to keep my distance from you. Unfortunately, you can run just as fast as I can. Most Rooks that I've played put money into speed items so they run faster (or force you to buy speed items). It is fairly hard to keep your distance from something just as fast if not faster than you are. And what exactly are you supposed to do if you are a melee Demigod? You have to approach the Rook. How do you not end up dead? Maybe if you could effectively run away it wouldn't be such an issue, but the Rook is good at chasing people in this beta.
I don't think the Hammer is OP thanks to the slow start up time (minus the Radius Bug, which really screws with a guy). Heck, even I can dodge a Hammer (now that I've discovered to not run directly away). However, he can charge up to you and slap fight. Even without the Hammer, he wins.
Just because it is "possible" to dodge the Boulder doesn't mean that it is balanced. I mean, you could infinately stall a Mavor in Vanilla SupCom by manually switching shields on and off to absorb the hits, but that didn't make it worthless as a game ender. The Boulder would be perfectly fine if it didn't stun you for long enough to be Hammered. However, between the Boulder damage and the Hammer damage, you start getting close to 3000 hp being taken away by a long range projectile with a fairly high movement speed and minimal start up time that can be spammed every 10 seconds. Sure, its possible to dodge, but like the Mavor in Vanilla SupCom, that doesn't make it any less deadly. The only difference is that the Mavor was a rare game ender, the Boulder is a way of life.
You say the Boulder Slam it isn't a combo, but I can't think of a faster way to dodge something than by activating the Oak's Shield. I recently played a match as Oak vs. Rook where I was the Oak. I occasionally managed to Shield at the absolute last second out of low level Boulder Rolls before he brought down the hammer. Without the Shield, even at moderate range there is no forseeable way you could dodge the second half of the Boulder Slam. Once the Rook Roll is at max level, then the stun is plenty long enough to hit from max range, stroll in, and slam. Again, maybe if the Rook was slower then it wouldn't be so much of an issue. Nothing is preventing you from Wand of Speeding in after Bouldering, which may have been what this guy was doing to me.
I hope you don't take this as a whining post, as I did not intend it to be that way. I would appreciate it if you came in and addressed the points I have brought up. I don't play Rook as he is definately OP, although the degree to which he is may be somewhat debatable. I would like to hear what a Rook player, heck, the best Rook player has to say about them. I think, at the bare minimum, his speed should be reduced and the cooldown for the Boulder should be increased to 15-20 seconds. If the speed is reduced enough, then the stun on the Boulder would be OK as he would mostly be closing the distance.
EDIT: Oh, and the Hammer Radius Bug could definately use fixing.