I thought the first few episodes of season 1 dragged a bit, but then I got pulled in. Only to be jarred by the shift of characters initially in season 2. Once I got the hang of how it all fit together there was no turning back and it has been my favourite show since.
Just two weeks ago I had some time off, spend it all re watching The Wire for the 3rd time. Was totally not my plan but a random youtube video set something in my brain.