What is there to possible counter play a blitzcrank?! it's literally a question of if you get hit you're as good as dead
Ok first of all, since it is a skillshot (and not an easy one at that) not getting hit or keeping minions between you IS counterplay.
Once dodged blitz hook has a long cooldown giving big window's of engagement. Its also is blocked by minions. Its actually a very hard to land skillshot. I can tell you aren't thinking clearly. I can tell because you aren't complaining about Thresh who has all the same strengths as blitzcrank and then some.
What if (blah blah blah it doesn't quote champ pictures.) could insta-killed you if you didn't flash?
Zyra E, and Anivia Q actually can win that way. And anivia doesnt need anyone to help her do it. She can chunk you for 2/3rds your health all on her own.
Hell the difference between a good and a bad blitzcrank is if they can press W+E and run strait at you to force a free Q hit.
Blitzcrank had his base stats nerfed into the ground to add risk to this technique. He isn't really tough enough to do this unless he is really ahead, and if he is ahead enough to do it then you already need help from your jungler. He has actually been made weak enough that unless he pulls you clear into his own minion line he isnt even likely to win the trade. You say being hooked is a complete death sentence but it actually isn't. It isn't any more than thresh hook or Nami bubble is. Blitz has virtually no damage to follow up on his hook, its all on his marksman. I don't see why you can't both start hitting his marksman with everything you have and taking them out.
Hes like leona if she didn't have damage. When leona hooks you, you ignore her and kill her marksman. Same deal with blitz. It is more terrifying and jarring ill admit but its not really any more powerful. If he pulled you into his minions and they are winning the trade for him then frankly you deserved to get hooked.
Blitz is notably better at supporting jungler ganks but there are other ways to avoid ganks (like warding) and he is allowed to have unique strengths like that.
All of this is not including matchups.
For an alistar support, blitz hooks do his job FOR him.