Thanks to Joe for the following.
Lost was placed 5th in a poll of the 50 greatest shows of all time in an Empire poll. Not sure if you know of Empire but it's he UK's biggest selling film magazine and I would assume that this poll would show up in a future issue. I voted for Lost and a couple of my other selections made the list too (Red Dwarf, The Office etc). Just thought this might interest you for the site.
http://www.empireonline.com/50greatesttv/