Well, my eyes aren't good enough to see some of the bends while holding the thing in my hand but when I roll it across my kitchen counter top you can definitely see that it has an eccentric roll (I'm pretty sure it's not the counter top. I can also see it when it's in the hub and I spin it. The freewheel isn't on yet but you can see the deflection, in this case just less than a millimeter.
I had an axle that was bent mostly on one side once and I was trying to true the wheel and I'd get it perfect and the unwittingly rotate the axle a little while installing it in the fork and the rim would hit the brake shoe. I'd true it up again and install it and it would happen all over again. When I finally figured it out I tried turning the axle all the way round with the wheel in the dropouts and the rim would drift all the way from one brake pad to the other.
It's a lesson I have to relearn every time I rebuild a cheap bike. I'm building fewer and fewer cheap bikes but I do have friends who can't afford anything better.