has anyone actually watched the delay on his stun? it would fail incredibly hard against most bot lanes. he throws it, and during the windup you know he'll be angling to get himself and you in the area. So it simultaneously gives you an area not to be in, and tells you where he's likely to put himself. ADC steps back, blitz knows to throw a hook soon, and his best way out just went on cooldown. With Janna's passive no one will be in the area. Leona jumps forward for a zenith blade, locking him down outside the area till it passes and auto winning the trade from there. Sivir shields, and he'd have to contend with a morgana black shield even a cat could time. Zyra snares, a Bard could line up a snare here. Virtually any support has a way of countering this, most with CC, and a CCed assassin is dead.
Using Q to poke seems to use a lot of mana for a little reward, when compared to morgana, sona, brand, zyra, or even less popular/meta supports like kayle, teemo. Heck, ANIVIA would do better as support and she can't do it at all*.
the only way it could work is early zone denial to lead into a perfectly done deep freeze, and if that gambit fails you're probably just SOL.
*Yes, yes, I know she's listed as one, high base damages, decent CC, that wall, etc. I love the bird, play her mid a lot recently. But the mana costs just don't mesh with a support's needs since the regen nerf: a recent game I built ROA, Seraphs, Athenes AND morellos and wasn't trolling about it.