As far as the Season 1 is concerned I think it is really good story in terms of the plot, the acting, the action, the drama, everything. The new concept of Meta humans from particle accelerator is really interesting and catchy. Infact the time travel concept shown is too good and very well explained so as to keep the viewer interested. The secret of Harrison Wells creates a very keen interest of the viewers and keep them occupied and forces them to watch the show every week without missing.
The last episode of Season 1 however was quite fascinating. It was very unaccepted what Barry did but that’s what keep the viewers interested.
As for Season 2, for me, its mehh. The concept were too much hypothetical and the direction of the plot is not that good either when you compare to season 1. The concept of the Earth-2 is too bizarre, atleast that’s what I felt.
The whole excitement after the season 1 is ruined by seasone 2. Infact the ending of season 2 was so pathetic and completely foolish.
I would say if you have a lot of patience only then watch this series because as far as Season 1 is concerned its good, but season 2 requires a great amount of patience.