What is your absolute favorite TV show of all time?
Game of Thrones.
I'd easily say Firefly if it had lived past 1 season.
It is impossible to say "ever". Depends on the time, my stage of evolution (I once love star trek the next generation but now hate it) and if I am sharing it with another (we both loved From Larkrise to Candleford - [en.wikipedia.org]. I now prefer British series (Like Endeaver and I loved "The Crown" ) but right now I am watching "The Good Wife" and it has become a present favorite.
All those I didn't watch because they made it possible for me to accomplish most of what I went after.