vilakins | Why Who?

At last I have finished my finish-a-thon story so I can relax and enjoy Torchwood tonight when Greg finally gets home. Then I'll be able to, as astrogirl2 has already said, read the third of my flist I've been avoiding.

Which leads me to wonder why very few other shows get so many reviews and opinions posted as soon as an episode airs. This doesn't happen for series like Lost, SGA, or BSG (though I do see one or two posts for the last). What makes Doctor Who and now Torchwood so different? The only other show that's come close is Life on Mars.