I have mixed feelings about all this. One the one hand, its a tractor, and we've heard that sentiment expressed many times and to a certain extent, I agree. Its a machine made to use in the dirt and to do dirty rough things with.
However, several other things come to mind. First, these small tractors are not being sold to county highway departments or corporate fleets. They're being sold to individuals and are really, when you get down to it, luxury items. Most of us don't make a living with then and don't have to have one. We could as easily buy a Harley, or boat. Many of us drive pick-ups with stereos, leather seats, AC and power everything. It's just a truck for hauling things but if there was a big old scratch or an ugly weld we'd have something to say about it. Right? Kubota, the small tractor king, has got to know this. People shelling out that much cash for a small tractor are not going to accept this sort of things. Dealers need to be aware too.
Bandaman, I don't know what I'd do in your situation. My tractor had a few dings. A little rust flake here and there. It didn't bother me much but its a bigger, less fancy machine than yours so I didn't worry about it. And I'll admit, any one of the things you showed wouldn't bother me either. But taken all together, I agree, pretty low care and/or quality.
My tractor now has a dent in the hood. It is very small. I did it. And I hate it. So I can sympathize.
The welds are probably perfectly fine, but they look like something you'd see on a Belarus.