As above. Especially notable with Rook, this is best in a combo with TB because he's got AoE stun and instant ranged stun. When you're 1v1ing, they've got enough cooldown, but when you're in a team, chain stunning is the only way to go. You get stunned, Hammersmashed, stunned, Fireballed, TB has ANOTHER stun, and you can be Hammersmashed again or just meleed for the win. And that's it. The only way to win is to do this back to your opp first. None of the other skills matter, only stun and nuke. Regulus is unusable. It's not so bad earlier, but especially when high-damage creeps come into the equation, stun-spamming is where it's at.
Change it to something else. If you could take potions or teleport out while stunned, it wouldn't be so bad, or if you could universally not be stunned for 5 seocnds after being stunned once, or hell, if there was ANYTHING you could do. Take your pick.