Normally when something is so highly praised (like the Wire) there's an inevitable backlash, at which point people start to vastly underate it (like in this list) in order to make up for all the overating and hype it's garnered.
I thought The Wire would be immune to this, because even people who haven't seen it and get bored of everyone banging on about how brilliant it is end up watching it and concedeing it's brilliance.
As a Sci Fi nerd, I've have liked to see X-File, Battlestar Galactica, Buffy etc a bit higher, maybe even include Serenity. The Guardian were always bound to under rate 24 because of it's reactionary politics, and in all fairness it's been a bit pants since season 4.