I do not have much down time on my hands, but when I do I always try to watch my favorite T.V. shows. I am currently watching Law and Order: SVU or Special Victim's Unit. Some of the T.V. shows that I am watching are crime shows, some are doctor shows and some are fiction (vampires and werewolves). It takes me a while to find something that I like after finishing a series. I know that other's, like you, will have trouble finding a show as well. I am going to give a few recommendations that might or might not help you find something that interests you.
1. Criminal Minds
I love this show mostly because of the relationship between the group of people. They are a great group of people that love their jobs and their families. They are always there for one another. This show is about a group of people that search for killers/rapists/serials.
2. Castle
This is another crime show. I honestly think this a great show because of the people that play the characters. I love that they love their work and I love that they come together and become a couple. This show makes me think that love is real.
3. Grey's Anatomy
I am pretty sure everyone knows about Grey's Anatomy but if you have not watched it, then I highly recommend this show. Even if you think you won't enjoy it, you really will enjoy it. It sinks your claws into you and hooks you. Then there is no going back after that.
4. The Walking Dead
This show is about zombies. Yes, zombies. I love this show. It is basically a family of different people that stick together to try and survive the apocalypse. I think that this show is for anyone that likes thrills and action.
5. H.O.U.S.E.
I can not even describe how good this show is. You just have to watch it, I am a Pre-Med major so I can relate to this show a lot because they are all doctors working together to save patients' lives. I think the actors are the best and they fit the characters perfectly.
Now I know that some of these shows may not appeal to you at first, but I am positive, that they will become appealing if you just watch a few episodes first. They will then, become very appealing to you.