If you want to know about status of serials then you should see who is directing it, like Ekta Kapoor if such name appears then I assure you it will be a boring and lengthy serial lot of unwanted twist, same old story which she used in her previous serials.
You should see since when the serial is been on air , and see the story if its going to end soon or not, and see how the story goes on twisting everyday.
You should see that if it consist of family drama , a drama which instead of creating peace at home creates more tensions and doubts in the hearts. Its very easy to know believe me.
Ekta is famous for her twist and increasing the length of stories serials , time killing and consuming, you never get to know where you wasted your time, was that time worth wasting on such silly stories or not, an awful stories, instead I would suggest watch some discovery channel, it always gives you some knowledge.