Hex is a blatant BuffytVS wannabe. However, it lacks the calibre of characters, actors, writers and directors that made Buffy what it was.
There doesn’t seem to have been any thought put into the overall story arc, instead it is a case of picking standard cliches (prophecy, demon-baby, fallen angels, witchy ancestors, pact with the devil, ghosts etc) and shoe horning them into the script along with some gratuitous teen lesbianism (or atleast the male fantasy, complete with lingerie-clad bedroom shenanigans) and a nude shower scene (the same scene was used in two different episodes) which were apparently filmed without the full consent of the actress, she was told they were filming from the shoulders up and only found out the truth when she sat down with her parents to watch the episode.
The second season saw the lead actress leave (who’d blame her after the nude scene issue), and any attempt at making sense left with her. Her replacement not only cannot act (possibly the fault of the script) but her character is blatantly a Buffyclone. I stopped watching after about 4 episodes of season 2.
The supporting characters and cast are really no better. It’s set in some sort of bizarre private mixed-sex sixth-form-only boarding school, where apparently there are a) no uniforms b) no rules c) no adult supervision afterhours. The students are a bunch of unlikeable spoilt-brats played by actors who seem to have been cast purely on their headshots. The headmaster is played by Colin Salmon, and comes across as a creepy old man (not in the horror sense, but in the sleep with me for grades sense).
Hex is a Sky Television production, which imo never bodes well. Sky seem to spend money on everything except the script. I’ve yet to see a Sky production that was actually any good (Battlestar Galactica doesn’t count and they only co-produced the first season).