...thinking you know about the US?

Seriously, I know US media is pervasive in Ireland, and there are plenty of Irish people who watch American television or read American newspapers, but I'm a bit curious: what are peoples' first-hand experiences with Americans in the US? Sometimes it seems like people have a very warped idea about the American people based on what they see on Fox News or what the government does, but as an American, I wouldn't like to judge Ireland based on Joe Duffy or Bertie Ahern. And although there is some truth to the stereotypes about us (I will freely acknowledge that we are a nation of lard-asses, although this varies by state), some of the perceptions of Americans I see on boards are truly warped.
Are folks here basing their opinions on their actual experience engaging with Americans in America, or just the media portrayal of us? Are the only Americans you've ever talked to wide-eyed tourists looking for leprechauns and their grandfather's cottage off in the wilds of Mayo? Or have you actually lived and worked in the US (and still come away with the idea that we are a bunch of lunatics)?