Supergirl sees DC follow the path blazed by Marvel's successful TV Shows such as Agent's of S.H.I.E.L.D., DareDevil, Agent Carter and having also met some success with Arrow and The Flash. The tone of Supergirl (and The Flash) feels a lot like a Marvel production with the light heartedness which marks a departure from the tone of DC's movies and Marvel's TV Shows.
Supergirl follows the life of Kara Zor-El, the cousin to Kal El (Superman) as she tries to juggle leading a normal life and a job, while saving the residents of National City from everyday threats as well as various aliens and metahumans.
While Supergirl has its moments particularly with the pilot and Red Faced but the other episodes dipped and ranged from meh to almost vomit inducing. Supergirl Season 1 suffered from having too many episodes. The showrunners could have gone the route that Marvel had taken with Jessica Jones and Daredevil by limiting the number of episodes to say 13 at most. Some episodes were clearly Superman stories rewritten for Supergirl. Also having the Martian Manhunter in my opinion wasn't a good idea, the CGI for the Martian Manhunter was subpar and looked like something from a PlayStation2 game.
At the end, Supergirl like The Flash, was fun for some time but it felt like it dragged on for too long. Would i recommend this TV Show to someone else, most definitely. It's kinda fun, if you like mindless fun. However this one TV Show that i wouldn't be following for another season.