I recently decided to watch "The Strain" as my Halloween series over October and can say I was pleasantly surprised by how well the story unfolded. The main characters, aside from the kid, were all fantastic. This show has a good balance of story telling, along with action and drama to keep you entertained. Furthermore, they did not stretch it out too long. 4 seasons was the perfect amount and the ending was good / provides closure to the series.
Reading other reviews I did see a lot of negative comments regarding the kid. And while I agree he was not a great actor nor did his decision end of season 3 make much sense, I feel that season 4 built on his character a lot and made the ending more satisfying.