What completed, not cancelled, TV series or limited series do you think there could or should have been more seasons of?

The Expanse. I'm happy it was completed and not cancelled but it felt rushed. Currently reading the books, on book 3/9, really good.

Enjoy the read one of my favorite book series ever.
I don't think we've seen the last of the expanse yet. I think we might see a bit more at some point.
- I know it isn't the same thing but there is an Expanse game coming out called The Expanse: Osiris Reborn. So at the very least we may get a big action rpg out of it.
  That said, I would love to see the show taken through all of the main series books instead of where they ended it in the show.

Watchmen is the first that comes to mind.

Also Peacemaker supposedly isn't going to get anymore seasons.

I'm actually watching Peacemaker right now but I'm not sure it's the kind of show that can really keep going. It's not going to go past season 2 then?

Over the Garden Wall

I do wish McHale got to put more things out. I'm excited to hear he's working on something coming out next year called the Elephant.
Fantastic series, I need to rewatch it again when the weather gets a little more Fall-like
Ooh yeah, but on the other hand, it's now the perfect length to binge on a dreary Sunday afternoon in October. So I think instead of a second season of Wirt and Greg, I'd like a new series of similar length, maybe a little darker and chillier, for a blisteringly cold November night.

Andor could have probably done with one more season to really flesh out Cassian accepting his rebel place. (Probably did not need the intended 5 seasons)

Someone who watched Better Call Saul before Breaking Bad told me that they thought Breaking Bad would've been better if it started with Gretchen, Eliot, and Walt starting Gray Matter together — followed them through the relationship breakdown due to Walt's insecurity and then Walt meeting Skyler before a Time Skip taking us to where season 1 picked up.

Firefly!

I don't think I'll ever be able to shift the feeling that we were robbed of more.

Edit - Realised I misread the title, was indeed cancelled not completed.

Wasn't Firefly famously cancelled?

Black books. I miss the mysantropic book seller.

The Wire. It wrapped up well, but i just want more.

I liked the deuce, as I thought it had a similar style of storytelling.
Treme I liked as well, but it's something else - not the same style as the other 2.
- Yeah. Neither Treme or The Deuce were finished.

Firefly

Wasn’t Firefly cancelled?
- Technically they completed the story in Serenety.
  That, or they misread the title at first like I did.

Supernatural. (^jk)

The O.A.

I really feel like they could have ran with the ending (even though I didn't like it) and went even crazier with the story.

I’m afraid I’ve got to go old school. If you’re looking for something that was completed but could have gone longer I say Quantum Leap. Don’t get me wrong the finale was great and I loved that Sam decided to keep leaping to help those in need, but man I could use more.

Shhh... Don't say it too loudly or someone will go and try to reboot it and completely ruin it.
- I love the new version. It wasn’t really a reboot but a continuation.

The Owl House.

The magicians could've used more seasons if they had more ideas

So much. I usually skip musical episodes, 90% of the time, but theirs were so damn good. Some serious vocal talent (4 octave range, bitch).
- Season 3+ was some of the best television I've seen. Once they abandoned the books and understood that they were doing their own thing that only really related in setting and themes they were really able to do justice to traumatized millennial grad students do magic that requires one to be a genius sans marbles.
  What they did with Margo and Eliot was moving without ever stopping being incredibly camp but also dark. The show perfectly hit the tone of laughing your ass off because your life went off the rails and now you're canceling an emergency therapy session to deal with stress because you absolutely cannot fit it into your schedule.
  Also by far the best deaf representation I've seen on TV, which was nice as someone hard of hearing
They ran out of books by the end. It's odd how much better the TV show was compared the the source whose first book was great and then got worse over the next two.
- They didn't even bother trying to adapt the third book more than loosely. I've never read them but my wife did and she felt that the whole theme of "Quentin isn't the protagonist of the world, he's just the point of view character" was much worse than just showing him as a character in an ensemble cast who struggles with main character syndrome. She also felt Grossman did Julia dirty with how she handled the aftermath of her rape.

I wish there was more HarmonQuest, or any new shows by Crittenden. I've been trying to get into Dimension20 and I super admire Mulligan's energy, but they all give a shit about the game. It feels off, somehow too earnest.

It feels a bit like if I was used to watching the Globetrotters just clowning around backstage with drinks with a long suffering coach, and now I'm watching a high spirited junior league with a really involved coach who gives 130% the whole time.

Although I feel season 5 (the last season) of Babylon 5 was a trainwreck, I would have liked to have seen something that was fully funded and supported by the network. Instead we got Crusade and The Legend of the Rangers, and then the TV movies.

Weep for Warners, Na'toth. Weep for us all.

probably the haunting of hill house. they did a 2nd season as a semi-anthology but it wasn't as good.
1899 was cancelled.
- I totally misread the question!

Infinity Train.

Yes!

"... And a movie."

No one dropped the ball on it. Sci-fi and the like were generally unpopular and anything called "Millennium" in 1999 would be seen as incredibly contrived.

Not sure if it counts, but I am pretty disapointed that Hannibal was just put on the shelf.

I casually knew Hetienne Park. I still haven't recovered from her death on that show. It was really messed up seeing slices of her.
- Yes that was the death that pissed me off the most I think.

Hap and Leonard

Bromwell High. Okay it was animated, but was worthy of many more episodes in more seasons IMO.

Plus I got introduced to Stephen Merchant, who is awesome!

Yo that show was wicked, thanks for reminding me the name

The Practice should have been longer. While Boston Legal was a fun spinoff, the hard hitting legal drama should have kept going as well.

Captain Star

Oh yeah didn't see it that way, I totally believe you.