What show never declined in quality?

[Master Factician]

I enjoyed Black Sails more with each consecutive season.

[kneehidude]

Joss Whedon's Firefly

[arandomuser]

american dad 10char

[Lollis]

Have to disagree with the Angel mentions somewhat, and for one main reason; Connor, especially the awful Cordelia storyline.
It stepped back up when he was 'written out' of the series later on but he was such a crappy character.

In general though:

Blackadder
The Wire (S2 and S5 have good and bad moments, overall the series stays steady though)
Buffy the Vampire Slayer (dips at parts in S5 and S6)
Breaking Bad
Farscape only gets better (with rare exceptions)

[minkage]

Have to disagree with the Angel mentions somewhat, and for one main reason; Connor, especially the awful Cordelia storyline.
It stepped back up when he was 'written out' of the series later on but he was such a crappy character.

In general though:

Blackadder
The Wire (S2 and S5 have good and bad moments, overall the series stays steady though)
Buffy the Vampire Slayer (dips at parts in S5 and S6)
Breaking Bad
Farscape only gets better (with rare exceptions)

I really love Farscape but holy hell the 1st half of season 4 is hard to watch until we hit unrealised reality and the season gets really awsome.

[Thelxi]

I can't think of a single one other than classics (and very short-lived shows) like Fawlty Towers. Even the very best shows curve down here and there or for entire seasons while still remaining great. I'd say the most consistent shows are usually lower quality shows like Modern Family that really don't have to do much to stay good.

I'd mention Stranger Things as one of the great shows that has stayed consistent in quality so far. Most of its cast were children that are now hitting puberty and adolescence at different rates, and I have a lot of admiration for how they handled that so successfully. It must be a minefield.

[Nathreim]

For anime Id say Cowboy Bebop, Lupin the Third (which started back in the 70s and is still going), and Trigun.

A year or two ago I would have said Dr. Who but the current doctor and series is TRASH.

Aqua Teen Hunger Force was always great I will never understand why CN canceled them when everyone from the actors to the writers wanted to keep on and the ratings were still great. It even had a successful movie that made 5.5 mill on a 750 thousand dollar budget.

Squidbillies is another gem that was great but canned for no reason.

[markos82]

Only fools and horses, Star Gate Sg1

[FuxieDK]

Breaking Bad, M*A*S*H, Star Trek: TNG, Cheers that’s all I can think of right now.

Breaking bad had a HUGE drop in quality mid S3 until mid S4.

[tankbug]

Mystery Science Theater 3000

Tim & Eric, maybe

[Bildur]

"Older shows" Sopranos, The Wire, Oz and my favorite Deadwood. Someone mentioned M.A.S.H. and I agree.
Newer shows starting with Breaking Bad, the spinoff Saul and most recently (for me) Amazons The Expanse Awesome sci-fi show .... GoT in spacel)

Honorable mentions of mini shows (1 season) Band of Brothers, Twin Peaks the Return.

P.S.
Forgot Westworld (so far, but that can be said about The Expanse too since there'll be more seasons (I hope))

[Amariw]

Code geass.

Naruto does decline but stays superb, and the decline is from five Kage summit which is past half the show, so writing it.

Saw Angel being mentioned, guess i agree, it never really turns bad.

[Bildur]

Chernobyl

Really looking forward to season 2!

ha ha ha
(I lived in a country nearby (or nearby enough) and remember being worried about going outdoors for days after until we were sure it was safe)

[vitor210]

Family Guy, for sure

[Asaliah]

Was about to say rick and morty but i've watched season4

[Phlegethon]

Many...

Black Books
The It Crowd
Farscape
Firefly (rip)
Dark Matter
The 4400 (waiting for that reboot)
Haven
Deadwood
Parks & Rec
Sons of Anarchy
Banshee (!!)
Eureka (hey I was a fan and did not want it to end)
Warehouse 13
Defiance

And many more...

[Blackmist]

Father Ted.

[Moggie]

In my own opinion,
-Six Feet Under was great from start to finish.
-Schitt's Creek
-MASH
-Brothers & Sisters
-The Office as idiotic as the last couple seasons were they were still pretty good overall
-Charmed (Original) though debatable considering the awfulness of the last seasons
-Weeds
-QaF
-Downton Abbey
-Being Human (US)

[TJ]

Breaking Bad is the first and probably the only one that comes to mind. So many other series have on and off seasons, but BB got better all the way through.

Breaking bad had a HUGE drop in quality mid S3 until mid S4.

Maybe to you, a lot of people including myself disagree. BB is known by the majority to have gotten better as it progressed.

[FuxieDK]

Maybe to you, a lot of people including myself disagree. BB is known by the majority to have gotten better as it progressed.

Actually not.. The majority on IMDB (when you could make posts), Rotten Tomatoes and similar sites, were in agreement that it took a turn for the worse, but did recover towards the end.