As a kid this was like my familys show. It was something we could all watch together, we could all understand, and we could all relate to in some way.
First of all, the show was not scary for me, and I'm a chicken. The special effects were funny, it was never very gory, and even the adult themes could be over looked by the youngest (aka me).
Secondly, the guys were... mmhmm. My sisters fell in love with them in their teenage years and were really able to getaway from the world through Merlin and Arthur's friendly banter.
Third, the acting and production design of this show was phenomenal. Katie Mcgrath made you really understand Morgana and was so kind and evil all at once that you just wanted to reach through the screen and give her a big hug (if she would let you).
Colin Morgan nailed his part as Merlin, was impish but clever but funny but nice but annoying. Everything he did and said was just so perfect... oh yes.
Bradley James had great comedic timing, understood his role, and litterely killed that sword wielding.
Angel Coulby... I will never forget the episode 'With All My Heart'. Gwen is such a controversial character in the myths, and she is so much more intimate and wonderful in this adaption. The rest of the cast and crew was amazing as well, not to mention the real castle and set.
All in all, I love this show and it will forever be my love. A must watch!