No spoilers - quick review from wotsits-

Story: 5/10. Easily the weakest part of all 3 seasons. Way too many plotholes, things that are just skimmed over and like any time travel show, there's very little care with actually dealing with loopholes in the story.

Music: 6/10. Feels like they just add random music sequences in the most randomest of times, albeit it's amazing music but.. why the hell does it go from quirky music to suddenly dark and scary when someone like Klaus turns a corner?

Characters 7/10. Honestly, Aiden.(5) and Robert (klause) carry this show so hard. Their acting is phenomenal and it feels like they're the only ones with a brain. Everyone else is a bit.. braindead, especially Allison and the majority of the sparrows.

Overall, it's a nice watch but not anything special at all, which is a shame because the show really did have an amazing concept, just felt like they weren't sure what direction to take it in, so they did everything, as can be seen in season 3. I will say, s1 and 2 are SO much better than s3.