That's exactly how I feel.
When you look at his lore, his subclass clearly should be Warden, a protective tank.
But in gameplay, he is a catcher. That subclass makes sense for Thresh, who wants to imprison souls to torture them. Or Zyra, who is a carnivorous plant and wants to consume everything. But does Blitzcranks lore really support a playstyle of "I grab that guy over there and doom him for death!"?
I don't think so.
Blitzcrank and Singed are the worst offenders when it comes to lore/gameplay disconnect. I would wish for them to get a VGU soon to tackle exactly that problem, but unfortunately it seems they are not really high priority in the VGU list....
Oh, and sorry to derail a bit more, but I want to mention Orianna as well. Her new lore is that she was once a girl replacing all her organic parts with hextech and clockwork. While her gameplay seems fine, I think her VO doesn't match that lore at all anymore. And I would like her movement to feel more natural....