Legend of the Blue Sea is a good drama and I do recommend the watch but it had the potential to be great. The first few episodes of this series were great but somewhere in the middle the plot became convoluted and muddled. But it did have a strong ending to finish it.
The best part of this series is the cast and it was great to see Lee Min Ho playing a kind of different role from Heirs and Boys Over Flowers. I just wish they spent more time focusing on him being a con artist rather than some of the reincarnation plot.
The first couple episodes are hilarious and I adore them.

Overall, I do recommend the watch and it is good series. It is just disappointing that it isn't great.