Ended too soon? Too many to list. My most recent gripe is half bad on Netflix.

Too long? Most recent is nurse Jackie.

Too soon: The Critic. We deserved more than 23 episodes of this brilliant show. It's too bad that the first season was on ABC who didn't know what to do with it, as they put it on before Home Improvement which was a completely different concept.

Too late: King of the Hill. It should've ended when Luanne and Lucky got married like it supposed to. Few of the episodes after that were memorable, and the finale wasn't as good as it could've been.

Both: Family Guy. The pre cancellation seasons were funny and the first couple of seasons after the revival were as well, but it insisted upon itself after awhile and the characters became more mean spirited than they originally were.

Even though I'm a fan of both shows 9-1-1 and 9-1-1: Lone Star have both been going on for far too long, them being forced to keep the teams together and not have any major character deaths, job changes, or major new additions really hampers how much they can do with the characters.

Terra Nova, Whiskey Cavalier, The Premise, and Y: The Last Man all ended too soon as well.

Kevin Spencer

https://www.imdb.com/title/tt0250876/

It's a Canadian show and I have no idea how it lasted for more than one season.

How to with John Wilson. Not too soon for the usual reasons. I believe he decided he had said his piece. But god damn do I want so much more.

Chop Sockey Chooks.

Ended too soon.

I saw the entire broadcast run of Clerks.

All both episodes.

Only six episodes were produced, and they eventually aired, but I did not find this out until years later. The internet ended a longstanding era where you could be aware of and interested in something, but know fuck-all about it, and have no sensible way of learning more. So I'd heard of Kevin Smith movies - but never seen any. Watching the Clerks movie would have taken a trip to a physical video-rental store, with my parents, and then convincing them (and myself) to rent a vulgar black-and-white movie for all of us to watch together. Wasn't happening. I was more likely to rent and watch any of the R-rated films that somehow got cartoon adaptations - which were part of that same impotent awareness. Robocop and Ghostbusters and fuckin' Starship Troopers were advertised anywhere and everywhere, and kids liked the shallow cool parts in the trailers, so executives said "fuck it" and licensed no-budget G-rated spinoffs to sell toys.

Anyway. The Clerks animated series exists because Disney wanted an adult-ish show to compete with The Simpsons. Everyone did. Disney knew they had a gap in their demographics for twenty-something dorks with disposable income. Aaand then they handed the finished episodes to ABC, who used a focus group of old farts and children. Of course it bombed. The first episode aired was a fake clip show full of flashbacks to episodes that did not exist. No, sorry, just checked Wikipedia: that was the second and final episode aired. The premiere ended with a wacky consequence-free style change, where the outsourced animators rebelled and delivered a lolrandom dance party.

At least Clone High got an entire season.

Too soon:

Firefly (obviously)

Black Spot

Too late:

Supernatural (by, like ten seasons)

Lockwood and Co ended too soon