I am watching the vampire diaries from the beginning of the 1st season. Everyone says it about only loves triangle, so its boring. Believe me, its not like that. Yes, there is a love triangle between, Damon, Stefan, two vampires who fall in love with a girl named Elena. But there are also other relationships which are shown in the show, like the relationship between brothers, sisters, parents, relatives and friends. it inspires to stand up against the ones we love, no matter what happens.
There different characters which teach us many things, such as Damon salvatore was a bad vampire at first but Elena inspired him to be good. His dark side and light side are always fighting. It is a show which will make you realize what friendship is, what love is and also what responsibility is. This shows us that anyone is capable of redemption, no matter how bad he was in the past.
If you are watching the show from mid seasons, you wont understand many things. I recommend watching it from the beginning and understand really what it is about. It is an awesome show, The ones who dont love romantic tv shows or movies, you should wait for at least 2 seasons to pass. I am sure you will love it if you will understand the storyline, the characters, and their relationships. Overall its an awesome show.