ER - From Start To Finish It Was Excellent. 15 Seasons and I don't think it ever dropped the ball. Managed to keep the humour and emotion going all the way through with some great guest actors and characters.
The Shield - This was adrenaline fuelled action from start to finish, on the edge of your seat stuff. And it kept that pace for all seasons.
Oz – Same as the Shield, loved this from start to finish. Was not sure what to expect but it was excellent and you grew to love some of the characters but they are all bad people some of them terrible people. Sign of great writing and a great show.
West Wing – I think people might say that it did dip but I have watched this twice now back to back with my missus and enjoyed it both times. Great writing and acting. Something I thought I would never enjoy but ended up just wanting to watch the next episode.
Battle Star (Reboot) – For me this is probably one of the greatest Sci Fi shows ever and tops even X- Files which I thought I would never say but for me X-Files did drop towards the end and lost the plot. No doubt people will say BSG did but for me it was excellent and I loved everything about it even all the religious rubbish
Mad Men – I still can't put my finger on why I like this show but I do and since the first episode to the last I have been hooked and I still can't think why
Hopefully the new seasons keep doing what it does best.
Breaking Bad – This has potential to top my list of shows, every season has excelled compared to the previous. A must watch and I hope it goes out on a high.
Deadwood – Excellent series with some outstanding acting from Ian McShane, was not sure on the ending but it kept me thinking about it for weeks and after talking with a few other people about it I realised it was a great ending because of how it made you want a certain type of ending from the start of the last episode to the very end.
It's Always Sunny In Philadelphia – It started great and has consistently been funny and had me giggling like a little girl in every episode. Am sure it will end on a high when it does.
A few mentions,
The Wire – Would have been on there If I had not taken so long to get into it, was not until middle of Season 2 that I really got into it. Similar to Breaking Bad but Season 1 of Breaking Bad was excellent but I was still unsure.
Entourage – Could have been on the list but the last few seasons were just a bit meh, still good but it kind of became a bit unbelievable and the last series just seemed rushed to me.