I do around 2-3 domestic trips in a quarter and use Jet Airways mainly because of connectivity and flight times.
I have bad experiences and good experiences, but in the main it is not worth calling Jet a full-service airline. The only difference is food; which again is not great.
I would say the seating comfort and staff experience is bad. Their crew needs to realize that they are expected to be more pleasant. Their punctuality(on time) is not great either. I would much rather fly a no-frills airline and get Value for Money.
I would not recommend it unless there are alternatives.