For what it was meant for, gaming systems (I'm right with that, right?)
It works beatifully on a strong system, and it doesn't really hog that much resources, comparing to the features it incorporates in those 1gb.
Win defender, search indexer (I love it since my 1tb drive, searches now just take a couple of seconds) the new caching system also works great, turn it off and apps are noticeably slower to load..
On old systems... It's a disaster, and it's released on MUCH to low specced systems most of the time, Vista on a laptop is just stupid.
And I would agree, 100% of my issues with vista at launch was Nvidia, but not graphics, motherboard drivers. They crashed ALL the time in all kinds of ways. Eight months into vista, nvidia finally released a driver that worked, only the odd BSOD.
Now with an all-AMD system, it's stable as a rock.