First season was pretty fine and storyline was bit graspy but the whole story got deteriorated in further seasons.I was really waiting for some good stuff but each season seems to have disappointed me which ultimately led to lot of time waste of mine -_-.The main storyline had
a lot of potential but unfortunately makers couldn't justify with it and failed to make connections between different season and episodes as well. I personally didn't like the science involved in it , lots of illogical stuffs and time travel concept hasn't been used well for weaving the plot. I would have rated it with 2 stars but 3 only for 1st season to at least make me jump to the other season.