My sense of wonder is just fine - because I can see multiple different "truths" that could be behind the appearance of the Stormcasts. They could be magical, or angelic, or technological ... or a combination of all three.
I think the Stormcasts look like ... one of the popular conceptions of angels (that is; ascended human beings, rather than a totally different order of creature). Or, they look like actual angels - the messengers and warriors of the gods. I've placed them alongside other models; they are bigger, significantly. But their heads are the same size - so they look more heroic following the classic rule.
In terms of a "sense of wonder", there really is that - we are so used to discussing the idea of a Space Marine, or an Elven phoenix, or even a steam tank that we forget just how amazing, how dramatic that would be. I recently saw a documentary on the first nuclear tests - and they had eye-witness accounts. We, today, are pretty blasé about massive explosions - but to those guys, this was ... terrifying.
To us, the Stormcasts are over-sized models. To the inhabitants of the Mortal Realms, they are nothing less than the warriors of the gods returning as liberators after uncounted centuries of slavery.
I really like that sense of wonder, that sense of newness - from all sides. It's just a fun place to play in. YMMV, of course.