In three seasons or less…
To start with, there’s * Star Trek: TOS*
Then there was * Quark*, which I think was a mid-season filler or something. I recall thinking it was hysterically funny when I was ten.
Nowhere Man (which I never actually caught, but I hear it was very good)
Get a Life - I need this like the Iliad needs a hundred more verses about Agamemnon. Sadly, this wildly funny series lasted only two seasons, but they were two of the greatest seasons in the history of the television sitcom.
Forever Knight. My (now ex) boyfriend ** hated** this show, mostly because he couldn’t reconcile the idea of a vampire being a decent sort of, um, human being. I loved the show. I was on a vampire kick when it was running, but I think I mostly liked it because Geraint Wyn Davies is sooooooooo hot. Kind of fell on its butt during the third season, largely for the same reasons * Bewitched* fell on its butt after Dick York left the show.
- The Prisoner* Not much I can say about this show. Very strange, very thought provoking, got an Iron Maiden song done about it.
I’m trying to recall any other really cool shows that should have lasted much longer than they did, but unfortunately didn’t have enough mainstream appeal to keep running beyond a couple-three seasons. Anybody care to help out here?