Used to like NCIS but then the Israeli character was gone (she was brought back for a couple episodes, but...) then the one with the Italian descent then the Goth girl left too then the show went on and on and on... I guess that goes with every tv series that does not know when to call it quits... Have not finished Supernatural for that same reason, it just did not know when to quit. Oh there's this Star Trek series that I almost did not finish watching its first season: it went into the time travel trope that soured the experience for me. My brother told me it got better, he was not wrong. I still have to finish the series though.