You're stupid.

AoE lockdown is the problem (Annie ult, Amumu ult, Sona ult), basically stuns and roots.

Knockups and Knockbacks, like Janna's ult, is fine.

Chain stunning still occours with many supports, Alistar, Leona still do the same value of damage Sona does, Sona also has to do it with a risk of getting instagibbed

What's your thought on AoE lockdown on AP mages? like Kennen, Morg, i know they are not instant, but they are OH GOD OH GOD OH GOD!

I'll never forget a game where my team totally dominated during the laning phase, then when midgame rolled around the other team had both Malphite and Sona on their team. Guess how every teamfight went? UNSTOPPABLE FORCE, CRESCENDO, AN ALLY HAS BEEN SLAIN, AN ALLY HAS BEEN SLAIN, ACED. We lost.

Howling Gale is used very frequently to lock down targets during ganks.

The cooldown is such that she can use it for escapes or kills, as most people being chased by Janna will be aware of:

She Birds you then she Tornados you, then if no one else has any CC, she floats in front of you and puffs you back into her team.

Janna's CC is a lot more lockdown than Sona.

This is true, though, those supports typically give up ranged harass (Alistar/Leona) or strong healing (Leona) or turnaround ultimates (Alistar) in exchange for their potential.

An Alistar lane, for example, is threatening but Alistar himself is a melee ranged stunbot whose heal tapers heavily off late-game to being unable to save others.

I think it's generally okay in the AP mage slot right now as stacking multiple AP mages quickly becomes hard to use effectively past mid-game.

While Janna certainly has a great deal of control over her opponent's in that scenario - her opponent's aren't actually disabled from taking offensive actions during a lot of that time. There's a lot of gaps where spells can be off-loaded with great effect. That string combo you mentioned isn't going to stop Annie from turning around with her full spell chain, for example.

For example, if Janna tried to participate in a lockdown string versus a mage or fighter line-up, she could certainly prevent them from running - but her opponents are equally free to turn around and unload nukes.

Ali's heal is the most powerful support heal in the game.

AoE, low mana cost, fast cooldown reset.

Excellent for sieges.

Gotta say wish and monsoon far outclass alistar's heal...

I mean it's good and has nice heal over time but janna and soraka are in da bsns of saving people whereas alistar's heal wont.

You raise a valid point - It's certainly very good in a sustained siege environment where minions are dying to contribute to the healing potential.

I was more referring to it as a supportive context - how effective is this skill from saving my allies from immediate threat.

Though you are correct in that if we ever see team fights getting much longer than 15 seconds then this 'weakness' of Alistars drops away.