I like lost.I'm not a teacher, but I used to correct and edit scholarly work. If you are are writing something serious like a review, the conjunction "while," should never be the first word. 

You should have your first sentence formulated into a strong topic sentence. 

If you say, "I jumped on the bandwagon for watching," you will notice that it cannot stand on its own and is not so great.  

by asking questions such as  >>makes your sentence run smoothly and such as is equivalent to the colon (:) that you previosuly used.

While I was Originally, I was reluctant to jump on the bandwagon for watching  for the series “Lost." Yet, it was when I accidentally watched one an episode of season 1 that I got totally hooked on this series and since then I have become a great fan and defender of it. 

Lost is a six season length drama series containing a clever combination of science-fiction, action and romance. It takes the simple idea of a passenger flight full of unknown people crashing onto a tropical island somewhere in the South Pacific Ocean. However, by making a brilliant use of the flashback and flashforward narrative technique, it gradually adds extraordinary depth to its premise by exploring each character deeply by asking questions such as who are they? Where did they come from? What drives them? It soon becomes clear that the island acts as a common denominator for all them.
Admittedly, it can be said that the Island itself is a living character alongside with the mysteries it houses holds: from the spooky black smoke to the enigmatic ancient buildings or the strange previous inhabitants mysteriously known as “the Others”

The following sentence is a run on sentence... when you wrote even though, I was expecting a real contrast. 

Even though In addtion to the dozens of elements that make of “Lost” a unique and must-see series that on no account should anybody miss out:  one should miss, the incredible cast, the inspiring scenery of an unspoiled island, the characters... the storyline is by far what outshines the others. When some of your questions are answered watching one episode, ten more are raised in the next. It is also worthy of special to make an honorary mention the controversial season finale that whether eventually you like it or not, it won't you leave you indifferent.

If you are a great fan of the thought-provoking series “Lost,” this should be, beyond doubt, at the top of your list. I strongly recommend it to you.