Stargate SG1 and Stargate Atlantis... even after long runs.
Terminator, The Sarah Connor Chronicles... It was just hitting it’s stride!
Sarah Connor Chronicles! I forgot about that one!
The network complained that the show was too “cerebral” and buried it on Friday night in order to kill it (IIRC).
The finale where they jumped through time was terrific.
Unfortunately, a lot of shows reach their best point just as they die (example: Dollhouse)