If your Vectra doesn't understeer, you're not driving it hard enough. I'm not suggesting you do, but it's true. All cars understeer. Especially front drivers like the Vectra. Even my car, which is about as neutral as a front driver can get without being seriously compromised for the road.
And what does make a Ferrari better than any other car in the universe? The high price? The expensive (and fragile) spares? The ridiculously high price?
There are cars that are better point-point than a Ferrari. There are cars that communicate and handle better than Ferraris. They're called NSXs. Heck, that's why they came up with the 360 and 430 in the first place, as many road-going Ferraris of that time had pretty dodgy handling compared to Honda's similarly ridiculously overpriced supercar.
There are no automotive absolutes... and no absolute truisms. To make any general or sweeping statements about cars based on where they're built is a good way to get pie in your face.
Especially with progress. Ten years ago, if I'd told you all front-wheelers handled like crap, I
might have been right... if I'd told you all Korean cars were pieces of crap that wouldn't last a thousand miles, I probably would have been...
But with automotive progress as it is, you can't make ready assumptions anymore. Hyundais nowadays actually last a pretty long time (But Daewoos are still crappy).
America still makes barges and boats, yes, but they've learned to make cars handle, too... see Lincoln LS, Dodge Neon (even just the R/T), the new Corvette Z06...
But of course, if you're adamant that all US cars are crap, then congratulations, you're an automotive racist.

That makes you just as bad as the guys who say anything without a V8 is crap, or that all Japanese cars are rice...