I began with the movie and it sucked ass and I was really creeped out by the siblings thing, then years later I tried the tv series of that movie (didn't know they were related), I was immediately hooked with the 1st episode (especially with the connection between Jace & Clary). To be honest the tv series was the best out of the books & the movie for me. I love reading, but the books didn't really hold my attention like the tv series.
In the series, Clary was irritating at first but I still liked her and learned to love her character more when she got better at fighting and less dramatic.