They started with this concept with series like American Chopper (I loved that). But now you see so many of them: Pickers, Axemen, Iceroad Truckers, LA Ink, Miami Ink, to name a few. I think because the keep going on with the same concept, it is a bit over the top already.
One series I really like is Cake Boss. The guy is a genius. This series made my wife creating cakes like that as well, so I don't complain.