In ice Yendor 3 I pick off the giants in groups of no more than 4. Pretty easy.
In Ice Yendor 1 and 2, I wasn't even aware you can pick off the giants without involving everyone. I've found than an extremely challenging room. Recently killed me again when I was trying to find a use case for the electric spell that spreads to adjacent units.
Which gets back to the original topic: lightning bolt might be extremely strong, but all the other the Air Mage skills feel weak.