Over time the one thing I've learned pretty reliably is that there are no must-see TV shows. Television is crap. It can certainly fill up idle time and it can provide background noise while you are doing other things, like eating and such, but on the whole, television hasn't contributed to the quality of my life for a very long while.
That isn't to say that television doesn't have anything entertaining in it, just that if I don't have a television, I don't feel it's absence in my life. The entertainment and reward I get from reading a book or sharing stories with others I like or love is far more rewarding to me than anything on television. If I have a choice between reading a book or TV, the book wins. If I have a choice between talking with friends or TV, the friends win. Television is what is on when you don't mind it's mindless chatter.
So, no, I have no must-see TV shows.