Daredevil. Cannot recommend it enough. ESPECIALLY if you're a fan of Arrow (Daredevil > Arrow > Flash > iZombie > Agents of SHIELD).
Batman The Animated Series - 90s cartoon but really good. Pretty true to the spirit of the comics, and without this series there may never have been a Harley Quinn (first appeared in TAS then first comic appearance was Batman Adventures #12.)
Recently got hooked on Falling Skies - four seasons to catch up on and the fifth, final season begins in June.
Cannot recommend Orphan Black enough.
And if you like Doctor Who then you're bound to love Red Dwarf, a British scifi comedy (so good it was revived 9 years after the last season ended with two more new seasons coming out over the next couple of years.)
Continuum
Defiance
Can't go wrong with MythBusters - entertaining, interesting, and even a smidge educational. Really love their themed episodes that tests the science of movies and tv (The Simpsons, Star Wars, The Walking Dead, etc.) but they're all quite enjoyable.
And while I can't personally recommend them yet (have it on queue for my post Falling Skies binge), I have heard excellent things about Elementary and The 100.
Edited by Alexiel, 19 May 2015 - 05:05 PM.