I just finished watching Volume 1 (includes Series 1 & 2) of Ramsay's Kitchen Nightmares. Aside from the menacing DVD cover and cheesy opening graphics animation, I thoroughly enjoyed watching the show and now have a little crush on Gordon Ramsay. [Interesting side note: while I was doing research about his background today I found out Ramsay was a professional football player at age 15!]
Kitchen Nightmares has also convinced me that US versions of existing UK shows aren't as good (some would argue that the American office is just as good as the British office, but I'm still not convinced).
Based on what I have seen on Fox of Hell's Kitchen, everyone would probably think Gordon Ramsay is an asshole. Sure, he swears and can be mean in Kitchen Nightmares, but he's giving constructive criticism and I feel that he honestly cares about and wishes success upon each restaurant he's visiting. This kind of sincerity rare for scripted television shows let alone for reality ones - I wasn't surprised to find out that it has won both a BAFTA and an Emmy.
Kitchen Nightmares is still being shown on Channel 4 in the UK and also on BBC America (too bad I don't have cable!). I supposed I could watch the US Kitchen Nightmares, but maybe I'll just wait for the next DVD to be released.