Penny Dreadful (don't even get me started - I haven't watched the 2hr series finale yet)
The Bastard Executioner (an amazing show that was never given a chance)
Rizzoli & Isles
Person of Interest
Under the Dome
Graceland (stuck with it to the end despite changes to the original storyline)
Continuum (stuck with it to the end despite changes to the original storyline)
Legends (stuck with it to the end despite the odd time jumps in the storyline that made it hard to follow unless you binge watched it)
2014 - were just starting to get good storylines and was cancelled prematurely imho
The Tomorrow People
Honorable mentions from years past:
Moonlight (anyone remember this one?)
While contemplating the list of TV series, I thought of the series Sliders from 1995-2000 and then I though I bet someone will remake this in the not too distant future...just a thought.
Did I miss any? Probably...I can always edit it later.