It goes from the mesmerizing season 1, where you're hooked to your tv and absolutely wanna know how everything will end, to a good season 2, not as good as the first but surely enjoyable, to season 3 where the show goes way down.

Season 1: 9 Great plot, good acting, incredible soundtrack

Season 2: 8 Good plot, same incredible soundtrack with something new

Season 3: 6 A bit stupid plot, not so good acting, the soundtrack is ok but not majestic as the others.

It lost it's sci-fi mistery notes to get an annoying teen drama way. The whole thing is brought by S1 and S2, let's hope S4 (which is 99% sure) will take its revenge.